BASE-LINE CHARACTERISTICS ARE NOT SUFFICIENT INDICATORS OF NONRESPONSE BIAS IN FOLLOW-UP-STUDIES

被引:52
作者
VESTBO, J [1 ]
RASMUSSEN, FV [1 ]
机构
[1] HILLEROD HOSP,DEPT MED B,HILLEROD,DENMARK
关键词
D O I
10.1136/jech.46.6.617
中图分类号
R1 [预防医学、卫生学];
学科分类号
1004 ; 120402 ;
摘要
StudY objective-The aim was to examine whether baseline characteristics from a cross sectional survey provided sufficient information regarding non-response bias in a follow up study when compared with information on hospital admissions in the intervening years. Design-This was an 11 year follow up study of a cohort selected in 1974 with register information on hospital admissions during follow up. Setting-The study was based on a sample of cement workers from a particular Portland cement factory with suitable controls from other occupations. Participants-A total of 1404 men participated in the first survey in 1974, including a questionnaire and lung function tests. In 1985 1070 men were alive and of these, 928 men (87%) responded to a postal questionnaire. Main results-Non-responders in 1985 did not differ markedly from responders when smoking habits, respiratory symptoms, and lung function were examined in 1974. During follow up, non-responders had twice as high rates of hospital admission due to respiratory diseases as responders. These differences remained present after adjusting for minor differences in age and smoking habits. Conclusions-Equal distributions of baseline characteristics among responders and non-responders in a follow up study do not preclude non-response bias.
引用
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页码:617 / 619
页数:3
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