Further evidence on dimensionality of the Index of Psychophysiological Stress.
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Age Factors↗
Biomedical subjects
R N Forthofer
Publications and source records attributed to R N Forthofer.
Effects of smoking on pulmonary function and symptomatology in occupationally exposed groups.
Records of 3006 employees of nine companies in southeast Texas screened by a local lung association during the years 1974-1975 were examined to assess the effect of smoking, age, and occupational and residential ambient air pollution exposure. The effects of smoking and occupational exposure were strong when tested against a respiratory morbidity response questionnaire considered to be diagnostic for early-stage bronchitis. Occupational exposure lost statistical significance after place of residence was controlled in the analysis. Smoking and age variables exhibited significant effects when the response variable was pulmonary function test results. The differences between questionnaire and pulmonary function test results may indicate early-stage vs. later-stage respiratory morbidity ascertainment. Agreement in classifying "abnormal" subjects with these two methods decreased with increasing levels of smoking.
Adult↗
Adjusting for nonresponse bias in a health examination survey.
There is a potential for nonresponse bias in most population studies using health examinations. This is true of the Mexican American portion of the Hispanic Health and Nutrition Examination Survey (HHANES), conducted by the National Center for Health Statistics, in which unit nonresponse to the examination accounted for 24 percent of the sample. Even though the full effect of nonresponse can never be really known, ancillary information from the interview sample can be used in an attempt to adjust for bias in estimates. Two techniques for nonresponse bias adjustment are presented and illustrated using health status level and hypertension status from published studies based on the HHANES of 1982-84. The first approach uses conditional probabilities and the second approach uses direct standardization. The examples examine whether or not an adjustment for socioeconomic status, sex, and age--variables related to both response status and the conditions under study--changes the prevalence estimates of (a) Mexican Americans who report poor, fair, or good health status and (b) hypertension among Mexican Americans.
Adult↗