Résumé :
|
[BDSP. Notice produite par INIST sfH8PR0x. Diffusion soumise à autorisation]. Patterns of exposure variability across pregnancy were examined for medical, lifestyle, residential, and occupational exposures in a population-based sample of 357 livebirths from 10 rural California counties. A new measure of variability, the ratio of overall prevalence to time-window-specific prevalence, is introduced. The higher the overall : time window (OTW) ratio, the greater the potential for misclassification when using anytime-during-pregnancy prevalence for an agent that exerts its effect in a smaller time window. Exposures to cigarettes, marijuana, saunas/hot tubs, factors related to location of residence, and some workplace substances tended to be of longer duration. Intertrimester concordance was high (kappa's>0.8) for smoking, residential proximity to crops, and use of video display terminals ; moderately high (kappa's between 0.4 and 0.8) for many occupational exposures ; and low (kappa's
|