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Biomedical subjects

Petra G Buettner

Publications and source records attributed to Petra G Buettner.

15 recordsLinked to original sources
PubMed2006

Predicting respiratory syncytial virus hospitalisation in Australian children.

BACKGROUND: There is limited information on respiratory syncytial virus infections among Australians, particularly those of Indigenous descent. AIM: This study identifies groups of infants at risk of hospitalisation with respiratory syncytial virus-positive lower respiratory tract infection who may be targeted for prevention with palivizumab. METHODS: Case control study: the case notes of 271 children with cases of respiratory syncytial virus-positive lower respiratory tract infection admitted to The Townsville Hospital were studied for risk factors. Controls were chosen randomly from babies born in The Townsville Hospital during that period. Multiple logistic regression analysis and classification and regression tree analysis were used to identify risk factors. RESULTS: Multiple logistic regression analysis identified birthweight <2500 g, maternal parity and marital status to be independent predictors of hospitalisation with respiratory syncytial virus-positive lower respiratory tract infection. Classification and regression tree analysis identified babies born weighing <2500 g who possessed older siblings to be at highest risk. Single mothers and smoking were additional risk factors. Indigenous babies were significantly more likely to be exposed to all of the identified risk factors. CONCLUSION: Babies born weighing <2500 g (especially with siblings) could be targeted for prevention. All Indigenous babies should be considered at high risk because of their exposure to multiple risk factors.

Adult↗
PubMed2006

Cost-effectiveness of respiratory syncytial virus prophylaxis with palivizumab.

BACKGROUND: A monoclonal antibody, palivizumab, directed against respiratory syncytial virus (RSV) has been shown to decrease hospitalisation rates. Because of its expense, the cost-effectiveness of this agent should be determined for high-risk groups. AIM: To determine characteristics of RSV infection in Townsville and the economic feasibility of palivizumab immunoprophylaxis in high-risk groups. METHODS: Cases of RSV-positive bronchiolitis were retrospectively identified. Cases were grouped according to recognised risk factors. The hypothetical costs of palivizumab immunoprophylaxis for infants at risk were calculated. RESULTS: The rate of hospitalisation with RSV-positive lower respiratory tract infection was 22 per 1000 live births but increased to 50 per 1000 among Indigenous babies born weighing <2500 g. The cost of preventing an admission in each of the identified high-risk groups, based on drug costs alone, ranged from AD 69,861 to AD 88,547. CONCLUSION: Palivizumab was not cost-effective in the prophylaxis of RSV in the high-risk group of infants tested here.

Antibodies, Monoclonal↗
PubMed2006

Prevalence of sexually transmitted infections in pregnant urban Aboriginal and Torres Strait Islander women in northern Australia.

OBJECTIVE: To assess the prevalence of sexually transmitted infections (STI) in a cohort of pregnant urban Indigenous women and association of STI with preterm birth, low birthweight birth and perinatal mortality. DESIGN: Prospective intervention program in a cohort of women attending Townsville Aboriginal and Islander Health Services (TAIHS) for shared antenatal care between 1 January 2000 and 31 December 2003 incorporating routine screening for chlamydia, gonorrhoea, trichomoniasis, hepatitis B and syphilis. SETTING: Townsville is a provincial urban centre with a regional Indigenous population of over 16 000. PARTICIPANTS: Four hundred and fifty-six pregnant women who were screened for bacterial STI and other viral infections. MAIN OUTCOME MEASURES: Prevalence of STI, associated risk factors and perinatal outcomes. RESULTS: Of the 456 women, 403 (88.4%) were screened for chlamydia, gonorrhoea and trichomonas and 432 (94.7%) were screened for syphilis. A total of 92 cases of STI (20.2%, 95% CI 16.5-23.9) were detected, with 21 concurrent infection(s). The overall prevalence of chlamydia was 14.4%, gonorrhoea 6.1%, trichomoniasis 7.2% and infectious syphilis 2.5%. Predictors for STI were young age, harmful/hazardous alcohol use and unwanted pregnancy. Low birthweight and perinatal death were significantly associated with the presence of STI and infectious syphilis during pregnancy. CONCLUSION: The prevalence of STI among pregnant women in this urban Indigenous community is high, suggesting that screening for STI should be included in all antenatal care protocols for Indigenous women in Australia. Strategies to reach the whole Indigenous community of child-bearing age, especially those aged less than 25 years, are needed to improve perinatal outcome.

Adult↗
PubMed2005

Impact of a collaborative shared antenatal care program for urban Indigenous women: a prospective cohort study.

OBJECTIVES: To evaluate the impact of a community-based, collaborative, shared antenatal care intervention (the Mums and Babies program) for Indigenous women in Townsville. DESIGN AND PARTICIPANTS: Prospective cohort study of women attending Townsville Aboriginal and Islander Health Service (TAIHS) for shared antenatal care with a singleton Indigenous birth between 1 January 2000 and 31 December 2003 (456 women; the MB group), compared with a historical control group of 84 women who attended TAIHS for antenatal care before the intervention between 1 January 1998 and 30 June1999, and a contemporary control group of 540 women who had a singleton birth at Townsville Hospital between 1 January 2000 and 30 June 2003, but did not attend TAIHS for antenatal care. INTERVENTION: Integration of previously autonomous service providers delivering shared antenatal care from TAIHS. MAIN OUTCOME MEASURES: Patterns of antenatal visits, proportion of women undertaking key antenatal screening, and perinatal outcomes. RESULTS: The number of Indigenous women who entered the MB program and gave birth at Townsville Hospital rose from 23.8% in 2000 to 61.2% in 2003. The number of antenatal care visits per pregnancy increased from three (interquartile [IQ] range, 2-6) in the historical control group to seven (IQ range, 4-10) in the MB group (P < 0.001). 88% of women in the MB group had at least one ultrasound. About 90% of all women attending for antenatal care were screened for sexually transmitted infections. In the MB group, there was a significant reduction in preterm births compared with the contemporary control group (8.7% v 14.3%, P < 0.01). There was no significant reduction in the prevalence of low birthweight births or perinatal mortality. CONCLUSION: A community-based collaborative approach to shared antenatal care services increased access to antenatal care and was associated with fewer preterm births among Indigenous women in Townsville. The model may be adaptable in other urban centres with multiple antenatal care providers and significant numbers of Indigenous people across Australia.

Adult↗
PubMed2005

The North Queensland "Sun-Safe Clothing" study: design and baseline results of a randomized trial to determine the effectiveness of sun-protective clothing in preventing melanocytic nevi.

In 1999, the authors began recruitment for a randomized controlled intervention trial aimed at preventing melanocytic nevi (moles) by minimizing sun exposure through the use of sun-protective clothing. The study involves 652 Caucasian children (75.6% response) aged 0-35 months from 25 child-care centers (n = 13 intervention and n = 12 control) living in the high-solar-irradiance environment of Townsville, Queensland, Australia. Children attending intervention centers wear investigator-provided garments made from fabrics with ultraviolet protection factors rated very good to excellent. Control centers continue to offer usual care. Three-year follow-up of all children will be completed in 2005. The main outcome measure is the number of new melanocytic nevi. At baseline, the two groups were similar with respect to nevi, phenotype, age, demographic characteristics, sun-protection habits, and history of sun exposure, except that more children from control versus intervention centers (2% and 0%, respectively; p = 0.006) had experienced painful sunburn with blistering. Higher melanocytic nevus counts were associated with more time spent outdoors and a history of sunburn, while sunscreen use, particularly during the mild winter months, appeared to have a protective effect. These findings further substantiate the hypothesis that nevus development in young children is related to sun exposure.

Child Day Care Centers↗
PubMed2005

Development of prognostic factors and survival in cutaneous melanoma over 25 years: An analysis of the Central Malignant Melanoma Registry of the German Dermatological Society.

BACKGROUND: Recent studies revealed that incidence rates of cutaneous melanoma (CM) were leveling off predominantly among younger people and patterns suggested birth-cohort effects. The current study analyzed the development of prognostic factors and survival in incident CM over 25 years. METHODS: All 45,483 patients with incident CM diagnosed between 1976 and 2000 recorded by the German Central Malignant Melanoma Registry were considered. Linear and logistic regression analyses were used to judge time trends. Trends of survival rates were tested with the multivariate Cox model. RESULTS: Median tumor thickness decreased from 1.81 mm in 1976 to 0.53 mm in 2000 (P < 0.0001). The percentages of in situ and level II CM increased, respectively (P < 0.0001). The percentage of ulcerated CM decreased (P < 0.0001). The percentage of superficial spreading melanoma increased, whereas the percentage of nodular melanoma decreased (P < 0.0001). These time trends were all significant in the strata of gender, however, male patients presented in general with more advanced disease. Between 1976 and 2000, the average patient got older (P < 0.0001). The percentage of patients diagnosed with the primary tumor alone increased (P < 0.0001). Across the 25 years of observation, adjusted survival rates did not increase for females (P = 0.1561) but they increased for males (P < 0.0001). CONCLUSIONS: The data demonstrated a strong trend towards prognostically more favorable CM most likely due to earlier diagnosis. Men and older people should be the focus of health promotion activities as they presented with more advanced disease.

Adult↗
PubMed2004

Impact of ulceration in stages I to III cutaneous melanoma as staged by the American Joint Committee on Cancer Staging System: an analysis of the German Central Malignant Melanoma Registry.

PURPOSE: In 2001, the new American Joint Committee on Cancer classification of cutaneous melanoma (CM) introduced ulceration of the primary melanoma as a new key parameter being represented in respective subcategories of the tumor (T) classification. The present study was performed to validate the prognostic significance of ulceration in relation to T thickness and clinical stages of CM (stages I to III). PATIENTS AND METHODS: Patients (N = 15,158) with incident invasive primary nonmetastatic CM and follow-up data recorded between 1976 and 2000 by the German Central Malignant Melanoma Registry were investigated using survival analysis to evaluate prognostic factors such as T thickness, level of invasion, body site, histologic subtype, ulceration, regression, age, and sex. RESULTS: Comparisons of survival probabilities according to the Kaplan-Meier method between ulcerated and nonulcerated CM were not statistically significant for subgroups with T thickness < or = 1 mm and more than 4.00 mm (P = .2601 and P = .0699, respectively) but were significant for T thickness of 1.01 to 2.00 mm and 2.01 to 4.00 mm (P < .0001 for both). This result was confirmed in the multivariate analysis. For stage III CM, the impact of ulceration on overall survival was statistically significant in the bivariate Cox model (P = .0111) but not in the multivariate Cox model (P = .0522). CONCLUSION: Whereas ulceration seems to have a negative impact on the prognosis of patients with stages T2 and T3, a potential influence for patients with stages T1 and T4 could not be established. If factors of the primary CM were to be taken into consideration to judge prognosis of stage III CM, T thickness but not ulceration should be the focus.

Female↗
PubMed2004

Prognostic factors of thin cutaneous melanoma: an analysis of the central malignant melanoma registry of the german dermatological society.

PURPOSE: The increasing number of thin cutaneous melanomas (CM) with tumor thickness up to 1 mm demands a detailed analysis of prognostic factors for the classification and grading of these tumors. The aim of the present study was to identify prognostic factors in thin CM. PATIENTS AND METHODS: A series of 12,728 patients with thin incident primary invasive CM and follow-up data recorded between 1976 and 2000 by the German-based Central Malignant Melanoma Registry was analyzed using the multivariate Cox proportional hazard model to evaluate prognostic factors, and classification and regression trees analysis (CART) to define prognostic groups. RESULTS: Multivariate analysis found tumor thickness, sex, age, body site, and histopathologic subtype to be significant prognostic factors of thin CM. Ulceration and regression did not affect prognosis significantly. Prognostic classification based on the results of CART analysis resulted in three groups defined by tumor thickness, age, and sex. Ten-year survival rates of these groups varied between 91.8% and 98.1%, with improved classification as compared with subgroups by tumor thickness alone. CONCLUSION: Classification by tumor thickness identified prognostic subgroups with highest significance in thin CM, and the classification was improved by the introduction of age and sex. However, neither ulceration nor the level of invasion included in the new American Joint Committee on Cancer TNM system classification, revealed statistical significance as prognostic factors in thin CM.

Adult↗
PubMed2004

Predictors of sun protection in northern Australian men with a history of nonmelanoma skin cancer.

BACKGROUND: It is important to understand what predicts regular use of sun protection in men susceptible to skin cancer. METHODS: A questionnaire survey of men with previous nonmelanoma skin cancer (n = 300) was conducted. RESULTS: Participants who typically used sunscreen tended to be younger, have fewer excised skin lesions, work indoors, and have spent most of their life in the tropics. Predictors of wearing a long-sleeved shirt with a wide-brimmed hat were not enjoying sun exposure, not having barriers to using sun protection, having more skin lesions previously excised, working for a company with a mandatory policy of sun protection, attitudes that the benefits of a suntan do not outweigh the risks and that skin cancers cannot be easily treated, and age over 50. CONCLUSIONS: Men who adequately protect themselves from the sun and who have better attitudes to sun exposure were more often those with a high level of negative experience with skin cancer. Therefore, the sun protection attitudes and behaviors of some men may only improve after significant sun damage. This study recommends that the use of appropriate sun protective clothing should be made mandatory for all who work outdoors in high-sun-exposure occupations.

Australia↗
PubMed2003

Australian women's prediagnostic decision-making styles, relating to treatment choices for early breast cancer treatment.

Women diagnosed with early breast cancer are now asked by their doctors to choose from a range of options for their preferred medical treatment plan. Little information is known about women's treatment decision-making and therefore nurses do not have evidence to guide this decision support. The aim of this descriptive survey was to investigate the prediagnostic decision-making behavior of a sample (N = 377) of Australian women, regarding their treatment choices for early breast cancer. The data were collected using the Pre-Decision Portfolio Questionnaire (PDPQ) by Pierce (1996), which includes the Michigan Assessment of Decision Styles (MADS). Of 366 participating women, 19.9% strongly agreed to all three items of the MADS factor Deferring Responsibility; 0.3% strongly agreed to all four factors of Avoidance; 32.7% strongly agreed on all four items of Information Seeking; and 63.4% strongly agreed to all five items of Deliberation. Women showed a variety of preferred decision styles, depending on age, education, occupation and employment status. Only 36% of women indicated it was critically important to "get the treatment over as soon as possible;" 55% to "participate in selecting treatment;" and 53% to "read a lot of information:" The understanding of factors that are important to women when they are making decisions for medical treatment is a mandatory step in designing customized evidence-based decision support, which can be delivered by nurses to help women during this distressing experience.

Adult↗
PubMed2002

How good are parents at assessing melanocytic nevi on their children? A study comparing parental counts, dermatologist counts, and counts obtained from photographs.

The objective of this study was to evaluate agreement among counts of melanocytic nevi made by parents, counts made by a dermatologist, and counts made by assessment of photographs. In 1990, 421 schoolchildren aged 6-15 years from Townsville, Queensland, Australia (latitude 19.16 degrees S), participated in the Eastern Australian Childhood Nevus Study. In an agreement study, parents were asked to mark on an anatomic diagram any melanocytic nevi greater than or equal to 2 mm in diameter and greater than or equal to 5 mm in diameter they observed on their child's back prior to the child's examination by a dermatologist; 324 parents responded (a 77% response rate). Standardized slide photographs of each child's back were taken, and melanocytic nevi were counted by an experienced non-medical-examiner upon projection. Agreement was assessed graphically and with the concordance correlation coefficient (r(c)). Parental counts of melanocytic nevi were similar to counts made by the dermatologist (n = 77; for nevi >or=2 mm, r(c) = 0.51; for nevi >or=5 mm, r(c) = 0.78) and counts obtained from the photographs (n = 324; for nevi >or=2 mm, r(c) = 0.68; for nevi >or=5 mm, r(c) = 0.68). Few parents reported false-positive lesions. Parents tended to underestimate the number of melanocytic nevi greater than or equal to 2 mm in diameter (mean difference from dermatologist: -3.2, standard deviation 6.8; mean difference from photographs: -1.1, standard deviation 5.1), particularly when the density of melanocytic nevi was high. Agreement between dermatologist counts and photograph counts was high (for nevi >or=2 mm, r(c) = 0.80; for nevi >or=5 mm, r(c) = 0.87). The authors conclude that parents are capable of counting melanocytic nevi on their children's skin with some validity. In epidemiologic studies of children, counts of melanocytic nevi obtained from standardized photographs have the potential to replace counts made by physicians.

Adolescent↗
PubMed2002

Multiple nonmelanoma skin cancer in an exposed Australian population.

BACKGROUND: Patients with nonmelanoma skin cancer (NMSC) frequently develop multiple skin cancers. The study presents incidence rates and rates of excision of NMSC for a population living in a high-risk environment for skin cancer. METHODS: Between 1997 and 1999 a prospective population-based study collected information on all histologically confirmed NMSCs in Townsville, Australia. RESULTS: Of the 6708 patients recorded with NMSC, 38.5% had multiple lesions. Yearly age-standardized incidence rates (per 100,000 inhabitants) of basal cell carcinoma (BCC) were 1444.8 for men, 942.7 for women, and of squamous cell carcinoma (SCC) were 805.0 for men, and 423.6 for women. Compared to incidence rates, age-standardized rates of lesions of BCC were 2.1 times higher in men, 1.6 times higher in women, and of SCC were 1.8 times higher in men and 1.4 times higher in women. CONCLUSIONS: The occurrence of multiple NMSCs compromises results of short-term studies on incidence. Further discussions on the most appropriate strategies to describe the real burden of NMSC are warranted.

Adolescent↗
PubMed2002

Sun-related behaviors of outdoor working men with a history of non-melanoma skin cancer.

The present study describes sun exposure and sun protection behaviors of northern Australian outdoor workers with previous non-melanoma skin cancer (NMSC). In 1999 a cross-sectional study of northern Australian men with previous NMSC was conducted by self-administered questionnaire. Compared to other men, outdoor workers spent more time in the sun on average working days and days off (P < 0.0001, respectively), and outdoor workers with sun-sensitive skin reported that more skin lesions had been removed (P = 0.0461). The workplace did not reinforce sun-safe practices of 36.8% of workers who spent half their time or more outdoors. Sun-protective behaviors were not different between in- and outdoor workers. Outdoor workers experienced high levels of sun exposure, however, sun-protective behavior was similar to other workers. Workplaces should be targeted to reinforce sun-safe policies.

Analysis of Variance↗
PubMedDate not supplied

Sunburn in Australian men with a history of non-melanoma skin cancer.

OBJECTIVE: To identify predictors of recent sunburn in north Australian men with a history of non-melanoma skin cancer (NMSC). METHODS: A survey of men with previous NMSC was conducted (n = 300, response rate 62%). RESULTS: Fifty-four percent of participants reported recent sunburn. Predictors identified included younger age, belief that NMSC is caused by childhood sun exposure, belief that sun protection will not help prevent further NMSC, wearing of casual clothes, and use of shade as the main sun-protection strategy. CONCLUSION: Health promotion messages should emphasize the importance of sun protection throughout life and the use of stringent sun-protection measures.

Attitude to Health↗