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Biomedical subjects

N P Dick

Publications and source records attributed to N P Dick.

5 recordsLinked to original sources
PubMed1976

Follow-up evaluation of a prevalence study for chronic bronchitis and chronic airway obstruction.

Follow-up of the prevalence study of respiratory symptoms and chronic airway obstruction was performed after a 6- to 7-year interval. One hundred fifteen of 117 subjects (98%) originally labeled "abnormal" (chronic bronchitis or asthma by history, or ratio of 1-sec forced expiratory volume to forced vital capacity less than 60 per cent), and 111 of a random sample of 116 subjects (96%) originally labeled "normal" were traced. Nineteen patients were dead, 14 "abnormal" subjects, and 5 "normal" subjects (P less than 0.01). Eighty-eight of the originally labeled "abnormal" subjects and 91 of the random "normal" sample could be retested by spirometry. Subjects with lower initial ratios of 1-sec forced expiratory volume to forced vital capacity tended to lose more 1-sec forced expiratory volume and forced vital capacity. Early identification of respiratory symptoms and spirometric abnormalities may identify persons at increased risk of death who could benefit from appropriate therapy.

Adult↗
PubMed1976

A comparison of spirometric values with subjects in standing and sitting positions.

Spirograms obtained from 235 subjects in standing and sitting positions revealed small differences for the forced vital capacity (FVC) and forced expiratory volume in one second (FEV1). No statistically significant differences were found for the mean forced expiratory flow during the middle half of the FVC (FEF25-75%, or maximal midexpiratory flow) and FEV1/FVC. Sitting values were, on the average, higher for determinations greater than FVC of 2.14 L, FEV1 of 1.68 L, FEF25-75% of 2.16 L/sec, and FEV1/FVC of 75.7 percent. On the average, subjects with less than these values performed slightly better in the standing position.

Adult↗
PubMed1976

The Denver prescreening developmental questionnaire (PDQ).

To facilitate periodic developmental screening of all children, a Prescreening Developmental Questionnaire (PDQ) was created to identify those children who require a more thorough screening with the Denver developmental Screening Test (DDST). Children positive on the DDST screen are then referred for a diagnostic assessment. To devise the PDQ, 97 of 105 standard DDST items were formulated into questions. Ten age-appropriate questions were answered by 1,155 parents with subsequent evaluation of their children with the DDST. Agreement between parental responses for individual items and the score for their children's corresponding DDST item varied from 68% to 100% (mean, 93.3%). When the PDQ was positive, 31.2% of the children were referred for a DDST screen. These referrals included 86.7% of abnormal and 53.8% of questionable DDSTs among the 1,155 children screened. The predictive value of a referral was 23.3%. The predictive value of a referral did not differ significantly whether the PDQ was answered by a parent or by day care center staff personnel. A subsequent field trial of 1,027 PDQs in private physicians' offices and public health clinics yielded a similar predictive value (24.7%) for a referral. The parents liked the PDQ which took them only about five minutes to answer and the physicians liked the PDQ since it decreased by almost 69% the number of DDSTs they felt obliged to administer.

Child Development↗
PubMed1975

Development of preschool-aged children of different social and ethnic groups: implications for developmental screening.

The developmental status of 1,180 children representing a cross section of Denver's ethnic and parental occupational groups was compared with that of 1,055 children (349 Anglo, 354 Spanish surname, and 352 Black) whose parents were unskilled workers. The children varied in age from 2 weeks to 6.4 years and were evaluated with the Denver developmental screening test. Comparisons were made in developmental achievements as reflected by individual item differences for Anglo children from unskilled families with Anglos from cross-sectional families. A second comparison of Anglo, Spanish, and Black children of the unskilled sample was also made. The first analysis comparing 910 Anglo children from the cross-sectional sample with 349 Anglo children from the unskilled families demonstrated significant differences (p smaller than 0.05) for 39 of the 105 items. Below 20 months of age, children of the unskilled sample were more advanced, whereas after 20 months of age, the children of the cross-sectional sample were advanced in all test sectors except for items in the personal-social sector. Comparisons of Anglo, Black, and Spanish surname children from the unskilled families showed fewer differences in rates of development.

Child Development↗