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Results for “Linear Regression”

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PubMed2006

Prediction of arterial blood gas values from venous blood gas values in patients with acute exacerbation of chronic obstructive pulmonary disease.

Arterial blood gas (ABG) analysis has an important role in the clinical assessment of patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD). However, arterial puncture or insertion of an arterial catheter has many drawbacks. The aim of this study was to evaluate whether venous blood gas (VBG) values of pH, partial pressure of carbon dioxide (PCO(2)) and oxygen (PO(2)), bicarbonate (HCO(3)), and oxygen saturation (SO(2)) can reliably predict ABG levels in patients with AECOPD. One hundred and thirty-two patients with a prior diagnosis of COPD presenting with acute exacerbation according to AECOPD criteria were included in this prospective study. AECOPD is defined as a recent increase in cough, wheezing, the volume and purulence of sputum or shortness of breath necessitating a change in regular medication, including corticosteroids or antibiotics. ABG samples were taken immediately after venous sampling, and both were analyzed. Linear regression analysis was performed and equations were established for the estimation of arterial values. The Pearson correlation coefficients for pH, PCO(2), HCO(3), PO(2), and SO(2) were 0.934, 0.908, 0.927, 0.252, and 0.296, respectively. There was a significant correlation between ABG and VBG values of pH, PCO(2), and HCO(3) (p < 0.001). Linear regression equations for the estimation of pH, PCO(2), and HCO(3) were as follows: arterial pH = 1.004 x venous pH; arterial PCO(2) = 0.873 x venous PCO(2); and arterial HCO(3) = 0.951 x venous HCO(3). VBG analysis can reliably predict the ABG values of pH, PCO(2) and HCO(3) in patients with AECOPD.

Acute Disease↗

PubMed1993

Effect of sway-referenced visual and somatosensory inputs on human head movement and postural patterns during stance.

The purposes of this study were to (1) evaluate the effects of sway-referenced visual and ankle somatosensory inputs on head movement and body sway during stance and (2) determine how sway-referenced sensory inputs might influence the selection of postural patterns. Seventeen healthy adult subjects were evaluated while attempting to maintain standing balance. Ankle somatosensory inputs were altered during stance by creating support surface rotations which were continuously adjusted ("referenced") to the center of force. In selected trials, ankle somatosensory or visual inputs were distorted further by increasing the platform/body sway gain or by increasing the sway-referenced gain of a rotating visual enclosure. The results showed that spontaneous body sway in a given direction was generally associated with head displacement in the opposite direction. The slope of the sway vs. sagittal head position linear regression line was statistically greater at a sway-referenced gain of 1.5 compared to a gain of 1.0. This finding was observed specifically when mechanical compliance of the support surface was increased and occurred whether the eyes were open or closed. Horizontal shear force was generated in the same direction as head displacement and the linear regression slope was greatest with eyes open and at a sway gain of 1.5. These findings indicate that (1) destabilization of the ankles altered displacement of the head independently from visual input, and (2) visual information was necessary to produce specific postural patterns utilizing horizontal shear forces to maintain stance on a mechanically compliant surface. The results provide evidence for a neural mechanism linking ankle somatosensory inputs and head control.

Adult↗

PubMed2003

Correction of compliance and resistance altered by endotracheal tube leaks.

OBJECTIVE: Measurements of lung compliance and resistance are influenced by endotracheal tube leaks. To keep compliance and resistance reliable, we developed an algorithm to correct inspiratory and expiratory volume and flow mathematically. DESIGN: Prospective, clinical study. SETTING: University research laboratory and neonatal intensive care unit. MODEL: A ventilated lung model with a linear pressure-volume relationship and with adjustment of an increasing endotracheal tube leak was investigated. PATIENTS: A total of 21 ventilated premature neonates (median weight, 1220 g; range, 640-2160 g; median leak, 32%; range, 24-56%) were studied. MEASUREMENTS AND MAIN RESULTS: Compliance and resistance were calculated from the recordings of flow, volume, and airway pressure over time employing linear regression of the equation of motion to obtain compliance and resistance. Compliance and resistance altered by leaks were corrected and compared with measurements without leak. Compliance and resistance of the lung model could be corrected up to an endotracheal tube leak size of 86%. Compliance and resistance without leak and after leak correction did not differ significantly for all infants using the linear regression method (p >.05). For the correction of compliance in 15 and for the correction of resistance in 12 of the 21 infants, the coefficients of variation of ten measured breaths without leak were greater or equal to the differences of the values of compliance and resistance between conditions of no leak and corrected leak, respectively. CONCLUSION: Pulmonary compliance and resistance can be reliably corrected even in the presence of a substantial endotracheal tube leak, which makes pulmonary function tests more reliable.

Airway Resistance↗

PubMed1999

Induction of micronuclei in V79 cells by fractions of roofing asphalt fume condensate.

More than 50,000 workers in the United States are exposed to roofing asphalt fumes that may pose genotoxic and potential carcinogenic hazards. The Type III roofing asphalt is most frequently used in roof-application. Results of our previous studies showed that fume condensates of Type III roofing asphalts induced micronuclei (MN) in vitro in cultured V79 cells and DNA adduct formation in vivo in rat lung cells. In this study, the genotoxicity of whole fume condensates (WFC) of Type III roofing asphalt and its five chemical fractions (A, B, C, D and E) was determined by the micronucleus assay using V79 cells. Linear regressions were determined for the dose response of MN frequencies and percent of binucleated and multinucleated cells (MTC) following the treatment. Results showed that the numbers of micronucleated cells in cultures treated with Type III roofing asphalt WFC and its fractions B, C, D and E were significantly higher than that in the control culture, and that the slopes of the linear regression line for fractions B and C were greater than those for the WFC and fractions D and E. A clear dose response of binucleated cells was also induced by the WFC and fractions B and C. These findings indicate that: (1) WFC and all fractions, except fraction A, induced MN formation in cultured V79 cells; (2) fractions B and C possess the highest genotoxic activity; (3) the roofing asphalt WFC contains chemicals or chemical classes that induce not only chromosomal aberrations but also binucleation in V79 cells.

Animals↗

PubMed2002

Prediction of spinal deformity in scoliosis from geometric torsion.

The shape of a curved line that passes through thoracic and lumbar vertebrae is often used to study spinal deformity with measurements in "auxiliary" planes that are not truly three-dimensional (3D). Here we propose a new index, the geometric torsion, which could uniquely describe the spinal deformity. In this study we assessed whether geometric torsion could be effectively used. to predict spinal deformity with the aid of multiple linear regression. Anatomical landmarks were obtained from multi-view radiographic reconstruction and used to generate 3D model of the spine and rib cage of 28 patients. Fourier series best fitted to the vertebral centroids approximated the spinal shape. For each patient, spinal deformity indices were computed. Torsion was calculated and 20 derived parameters were recorded. Torsion inputs were used in a multiple linear regression model for prediction of key spinal indices. The primary clinical Cobb angle (mainly thoracic) was predicted well, with r=0.89 using all 20 inputs of torsion or r=0.83 using just two. Torsion was also well related to the orientation of plane of maximal deformity (r=0.87). Torsion was less accurate but still significant in predicting maximal vertebral axial rotation (r=0.77). This preliminary study showed promising results for the use of geometric torsion as an alternative 3D index of spinal deformity.

Adolescent↗

PubMed1978

Skin colorimetry in Belize. I. Conversion formulae.

Comparisons between skin colorimetry reports have been hampered by the common use of two different types of portable reflectometers, which sample reflectances at different wavelengths. In an attempt to provide direct comparability between the two machines, multiple linear regression equations were derived from reflectance spectrophotometry readings on 308 Black Caribs and 175 Creoles in Belize, Central America, using both machines. Cross validation tests show the coefficients presented are applicable to independent data sets and generally applicable to other heavily pigmented populations. Comparisons with previously published conversion formulae, which were from very small samples using simple linear regression, show a definite improvement in predictive accuracy when using multiple regression equations based on a large sample.

Belize↗

PubMed2007

In healthy subjects without knee osteoarthritis, the peak knee adduction moment influences the acute effect of shoe interventions designed to reduce medial compartment knee load.

The purpose of this study was to evaluate shoe sole material stiffness changes and angle changes that are intended to reduce the peak knee adduction moment during walking. Fourteen physically active adults were tested wearing their personal shoes (control) and five intervention pairs, two with stiffness variations, two with angle variations, and a placebo shoe. The intervention shoes were evaluated based on how much they reduced the peak knee adduction moment compared to the control shoe. An ANOVA test was used to detect differences between interventions. Linear regression analysis was used to determine a relationship between the magnitude of the knee adduction moment prior to intervention and the effectiveness of the intervention in reducing the peak knee adduction moment. Peak knee adduction moments were reduced for the altered stiffness and altered angle shoes (p < 0.010), but not for the placebo shoe (p = 0.363). Additionally, linear regression analysis showed that subjects with higher knee adduction moments prior to intervention had larger reductions in the peak knee adduction moment (p < 0.010). These results demonstrate that shoe sole stiffness and angle interventions can be used to reduce the peak knee adduction moment and that subjects with initially higher peak knee adduction moments have higher reductions in their peak knee adduction moments.

Adult↗

PubMed1996

The role of melatonin in the pathogenesis of adolescent idiopathic scoliosis.

STUDY DESIGN: A matched, case-control study comparing melatonin production in female patients with and without adolescent idiopathic scoliosis. OBJECTIVES: To determine whether melatonin production is decreased in adolescent idiopathic scoliosis. SUMMARY OF BACKGROUND DATA: A central etiology for idiopathic scoliosis has never been established. Previous authors have produced experimental scoliosis in chickens after pinealectomy, preventable by administration of melatonin. They suggested that a defect in melatonin synthesis might be involved in the pathogenesis of human idiopathic scoliosis. METHODS: Nine female adolescents with no medical problems, normal neurologic examinations, radiographic idiopathic scoliosis of 15-40 degrees, and Risser Stage I-III were in the patient group. Eighteen healthy adolescent girls with no medical problems, a negative school screening, and no family history of scoliosis were control subjects. Patients and control subjects were matched for age, weight, Tanner stage, sleep duration, and light exposure by multiple linear regression. Nighttime and daytime urine samples were analyzed for melatonin by high-performance liquid chromatography. RESULTS: Although nighttime melatonin levels were significantly higher than daytime levels in all volunteers (P < 0.00002), there were no significant differences in nighttime (P > 0.63) or daytime (P > 0.78) melatonin levels between patients and control subjects, even after matching by multiple linear regression analysis. A statistical analysis demonstrated that if a melatonin deficiency of 25% or more did exist in patients with scoliosis compared with control subjects, the likelihood that it would have been detected in this study was more than 98%. CONCLUSION: Although melatonin deficiency may cause scoliosis in the chicken, this study suggests that it is not a mechanism in the pathogenesis of adolescent idiopathic scoliosis in humans.

Adolescent↗

PubMedDate not supplied

Stereological analyses of hepatocyte changes parallel arsenic accumulation in the livers of green sunfish.

Cellular changes in hepatocytes of green sunfish (Lepomis cyanellus) exposed to arsenic-contaminated or control lake water were compared with the level of arsenic in the liver. Standard stereological procedures involved conversion of two-dimensional data (i.e. fractional measurements of morphological changes) to three-dimensional data for interpretation. Both the volume and numbers of nuclei increased slightly with increasing concentration of arsenic in the liver. Significant increases (p less than 0.01) were observed in the volumes occupied by necrotic and fibrous bodies as arsenic levels in the liver increased; linear regression analysis of these data resulted in 0.9066 and 0.9359 correlation coefficients for necrotic and fibrous bodies, respectively, when volume changes were considered on a unit body weight basis. The volume occupied by necrotic areas, abnormal lysosomes, and autophagic vacuoles increased with increased arsenic concentration. The surface density of rough endoplasmic reticulum increased with increasing arsenic concentration; linear regression resulted in a correlation coefficient of 0.8367 when data were based on unit body weight.

Animals↗

PubMed1996

Contribution of dieting to the inverse association between energy intake and body mass index.

OBJECTIVE: To examine the association of energy and % energy from fat with body mass index (BMI) and determine if self-reported dieting altered observed associations. DESIGN: Dietary intake data based on dietary recalls from four nonconsecutive days over a 1 year period were examined relative to BMI. The relation between energy intake and % energy from fat and BMI was examined by linear regression analysis. SUBJECTS: The sample included 1854 free-living women aged 19-50 years who participated in the 1985-6 Continuing Surveys of Food Intakes by Individuals conducted by the United States Department of Agriculture. RESULTS: Reported energy intake was inversely associated with BMI (regression coefficient (beta) = -0.001 24, standard error (s.e.) = 0.000 31). Controlling for low energy dieting alone reduced the inverse energy intake-BMI association by approximately 20% (beta = -0.001 00, s.e. = 0.000 31), compared to reductions of 16%, 13% and 10%, respectively, when health status, age and education were added individually to the energy intake-BMI linear regression. Physical activity, smoking status, % energy from fat and report of low fat dieting did not reduce the energy intake-BMI association. Controlling for nondietary factors related to BMI and potentially influencing energy intake reduced the inverse energy intake-BMI association by approximately 22% (beta = -0.000 97, s.e. = 0.00025). Further adjustment for low energy dieting on day 1 reduced the inverse energy intake-BMI association by 40% (beta = -0.000 74, s.e. = 0.000 26), suggesting that intermittent energy restriction was a significant factor in the reduced energy intake reported among overweight women. Percent energy from fat was not associated with BMI (beta = 0.049, s.e. = 0.025, P = 0.055). Exclusion of 37 women reporting poor health status further attenuated the inverse association between energy intake and BMI (beta = -0.000 64), s.e. = 0.000 26), while it strengthened the previously non-significant positive association between % energy from fat and BMI (beta = 0.062; s.e. = 0.024). CONCLUSION: Intermittent energy restriction appeared to be a significant factor in the reduced energy intake reported among overweight women in this sample. Adequate assessment of energy expenditure is required to correctly interpret the association of energy intake to body weight.

Adult↗

PubMed2005

Diet quality in 116 Norwegian men and women with coronary heart disease.

BACKGROUND AND AIMS: Clinical intervention studies have provided strong evidence that a healthy diet can prevent coronary heart disease. The aims of this study were to describe the diet quality in Norwegian subjects from Sogn and Fjordane County with coronary heart disease, and to investigate if the diet quality was associated with demographic and lifestyle variables. METHODS: We used a self-administered questionnaire to assess information from 116 participants. A Healthy Diet Score (HDS) indicated the diet quality. Multiple Linear regression analyses were used to investigate associations between relevant variables and the HDS. RESULTS: We found that 26.7% of the participants had a poor HDS, 64.6% had a fair HDS and 8.7% had a good HDS. We found that the widespread suboptimal diet quality (poor or fair HDS) was partially related to low consumption of nonhydrogenated mayonnaise products, vegetables, and fruit/berries/juice. Multiple linear regression analysis showed that women had better HDS than men, and that subjects with high education had better HDS than subjects with low education (P < 0.05). CONCLUSION: We found that 91.3% of the participants had a suboptimal diet quality. The consumption of nonhydrogenated mayonnaise products, vegetables and fruit/berries/juice were poor and a principal goal should be to increase the consumption of these food items. Health professionals should keep in mind that gender and educational level may be associated with dietary habits. An important clinical implication of this study is that more attention should be paid to dietary counselling.

Aged↗

PubMed2002

External contribution to urban air pollution.

Elevated particulate matter concentrations in urban locations have normally been associated with local traffic emissions. Recently it has been suggested that such episodes are influenced to a high degree by PM10 sources external to urban areas. To further corroborate this hypothesis, linear regression was sought between PM10 concentrations measured at eight urban sites in the U.K., with particulate sulphate concentration measured at two rural sites, for the years 1993-1997. Analysis of the slopes, intercepts and correlation coefficients indicate a possible relationship between urban PM10 and rural sulphate concentrations. The influences of wind direction and of the distance of the urban from the rural sites on the values of the three statistical parameters are also explored. The value of linear regression as an analysis tool in such cases is discussed and it is shown that an analysis of the sign of the rate of change of the urban PM10 and rural sulphate concentrations provides a more realistic method of correlation. The results indicate a major influence on urban PM10 concentrations from the eastern side of the United Kingdom. Linear correlation was also sought using PM10 data from nine urban sites in London and nearby rural Rochester. Analysis of the magnitude of the gradients and intercepts together with episode correlation analysis between the two sites showed the effect of transported PM10 on the local London concentrations. This article also presents methods to estimate the influence of rural and urban PM10 sources on urban PM10 concentrations and to obtain a rough estimate of the transboundary contribution to urban air pollution from the PM10 concentration data of the urban site.

Air Movements↗

PubMed2006

Analysis and prediction of flow from local source in a river basin using a Neuro-fuzzy modeling tool.

Traditionally, the multiple linear regression technique has been one of the most widely used models in simulating hydrological time series. However, when the nonlinear phenomenon is significant, the multiple linear will fail to develop an appropriate predictive model. Recently, neuro-fuzzy systems have gained much popularity for calibrating the nonlinear relationships. This study evaluated the potential of a neuro-fuzzy system as an alternative to the traditional statistical regression technique for the purpose of predicting flow from a local source in a river basin. The effectiveness of the proposed identification technique was demonstrated through a simulation study of the river flow time series of the Citarum River in Indonesia. Furthermore, in order to provide the uncertainty associated with the estimation of river flow, a Monte Carlo simulation was performed. As a comparison, a multiple linear regression analysis that was being used by the Citarum River Authority was also examined using various statistical indices. The simulation results using 95% confidence intervals indicated that the neuro-fuzzy model consistently underestimated the magnitude of high flow while the low and medium flow magnitudes were estimated closer to the observed data. The comparison of the prediction accuracy of the neuro-fuzzy and linear regression methods indicated that the neuro-fuzzy approach was more accurate in predicting river flow dynamics. The neuro-fuzzy model was able to improve the root mean square error (RMSE) and mean absolute percentage error (MAPE) values of the multiple linear regression forecasts by about 13.52% and 10.73%, respectively. Considering its simplicity and efficiency, the neuro-fuzzy model is recommended as an alternative tool for modeling of flow dynamics in the study area.

Forecasting↗

PubMed1994

Weight-bearing activity during youth is a more important factor for peak bone mass than calcium intake.

In a 15 year longitudinal study (Amsterdam Growth and Health Study) is evaluated the effect of daily calcium intake (CAI) during adolescence and young adulthood on the development of peak bone mass at age 27 when the influence of weight-bearing activity (WBA) and body weight was accounted for. A group of 84 males and 98 females were measured longitudinally from age 13 until age 28. Measurements were taken six times of anthropometric characteristics. Lifestyle was also evaluated six times by cross-check interviews of CAI and WBA. Bone mineral density (BMD) of the lumbar spine was determined at age 27 by dual x-ray absorption. Three periods were considered, that is, the adolescent period, the period 13-21 years, and the total period (13-27 years). In multiple linear regression analyses, only WBA and body weight were significant positive contributors to the final model of lumbar BMD at age 27. In all three periods WBA was the best predictor in males and body weight in females. ANOVA was performed on BMD and the highest and lowest quartiles of calcium intake with the significant predictor variables of the linear regression model as covariates. Again calcium intake appeared not a significant predictor of BMD in the three periods in both sexes. Regular weight-bearing exercise and at least a normal age-related body weight in adolescence and young adulthood are of key importance in reaching the highest lumbar peak bone mass at the age of 27 years.

Absorptiometry, Photon↗

PubMed1996

Retarded heart growth in the victims of sudden infant death: possible implications for lethal mechanisms.

UNLABELLED: The study was aimed to compare the weight of the heart at death in infants who died of sudden infant death (SID) and in control infants under 1 year old. The study included 227 infants who died in St. Petersburg in 1983 to 1990 and who met the criteria of SID. One hundred and thirty-eight infants who died within 24 h out of hospital of defined respiratory infections within the same period of time constituted a control group. Infants with signs of malformations, tumours, and intrauterine infections were excluded from the study. A linear regression model was used in data analysis. No statistically significant association was found between the weight of the heart by the time of death and the following variables: gender, birth weight and length, ponderal index at birth, gestational age, calendar age at death, and length at death. Two variables which significantly influenced the heart weight and entered the linear regression model were infant's weight by the time of death and the cause of death (whether SID or not). No statistically significant interaction was found for these two parameters. It was found that each increase in total body weight by 1000 g brought with it an increase in the heart weight by 4 g (95% CI = 3.6-4.4); for the SID babies, the weight of the heart was less than for the control ones by 1.6 g (95% CI = 0.3-2.9 g). CONCLUSION: Retarded heart growth may lead to functional disturbances and may contribute to possible mechanisms in some SID cases.

Anthropometry↗

PubMed2001

Reference data and predictive diagnostic models for calcaneus bone mineral density measured with single-energy X-ray absorptiometry in 7428 Chinese.

Calcaneus bone mineral density (BMD) of 7428 Chinese (4126 women, 3302 men; aged 22-94 years) was measured using single-energy X-ray absorptiometry (SXA). A reference range of calcaneus BMD values for healthy Chinese men and women was established and the usefulness of this method for screening and diagnosis in osteoporosis was evaluated. The peak BMD occurred at 20-24 years old and peak BMD in women was significantly lower than in men. BMD loss in the calcaneus started at the age of 35 years for women, and at 63 years in men. BMD loss rate was 1.2%/year for women and 0.56%/year for men after 50 years. The young normal reference for calcaneus BMD was 442.1+/-69.6 mg/cm2 for men and 388.3+/-61.7 mg/cm2 for women calculated from the mean BMD value of subjects whose age ranged from 20 to 49 years. The accumulated BMD loss in the calcaneus is similar to that of Ward's triangle. Multiple linear regression showed that both age and weight were important factors. The incidence of osteoporosis in older men and women (> or = 60 years) is 6.6% and 32.1% respectively. We conclude that calcaneus BMD measurement is useful and sensitive for the screening and diagnosis of osteoporosis. A predictive diagnostic model for osteoporosis based on the calcaneus was constructed using multiple linear regression and the WHO criteria for diagnosing osteoporosis can be applied to calcaneus BMD.

Absorptiometry, Photon↗

PubMed2004

Use of systematic reviews in the development of new provincial public health policies in Ontario.

OBJECTIVES: The study determined whether the results of recently completed systematic reviews evaluating the effectiveness of public health interventions were used in the development of new provincial policies for public health practice. METHODS: This telephone survey included all members from five review groups who updated the Ontario Mandatory Health Programs and Services guidelines for Public Health in 2000. Independent variables included characteristics of the systematic reviews, organization, and the individual. Outcomes included the use of the reviews in developing new policies and the extent to which the reviews led to new recommendations for practice. Descriptive summaries as well as multiple linear regression were conducted. RESULTS: Eighty-five percent of decision-makers agreed to participate in the study. Ninety-six percent of respondents reported that the systematic reviews played a part in developing the new guidelines, while 47 percent indicated that the reviews contributed a great deal to the development of new recommendations for practice. The multiple linear regression model explained 42 percent of the variation in use of the reviews for developing new recommendations for practice. Significant predictor variables included the importance of the reviews in comparison to other sources of information and relevance of the reviews to the policy decisions. CONCLUSION: Public health decision-makers in Ontario have very positive perceptions of the usefulness of systematic reviews in policy development. Therefore, ongoing efforts to promote the usefulness and relevance of systematic reviews to public health decision-makers should remain a priority for health services researchers.

Cross-Sectional Studies↗

PubMed2004

The effect of a forearm/hand splint compared with an elbow band as a treatment for lateral epicondylitis.

The aim of the present study was to compare the effect of a new prefabricated Thämert forearm/hand splint with the effect of a simple elbow band as a treatment for lateral epicondylitis. Forty-three (43) patients that met the inclusion criteria were randomly assigned to the elbow band group and the splint group. They wore the orthotic devices for 6 weeks. Outcome measures were obtained at baseline and directly after the intervention. These outcome measures were maximal grip strength on the involved side with a pain scale from 1 to 10 to determine the extent of pain during gripping, and the Patient-Rated Forearm Evaluation Questionnaire (PRFEQ). Analysis of variances with repeated measures, a Mann Whitney test and multiple linear regression analysis were used to compare the two groups. Main effect for time was significant for maximal grip strength and sum scores on the PRFEQ, but no differences between groups were found, even when a distinction between acute and chronic symptoms was made. Change in pain score during gripping did not differ significantly between the groups. A multiple linear regression analysis showed that the use of the splint did not significantly contribute to the prediction of change in maximal grip strength and in overall PRFEQ. The conclusion is that the forearm/hand splint is not more effective than the elbow band as a treatment for lateral epicondylitis.

Adult↗