Simultaneous-equation estimation in a clinical trial of the effect of smoking on birth weight.
Controlled experiments can be used to study the effects on health of behaviors that cannot be perfectly controlled. A simple statistical technique allows causal effects to be distinguished from selection effects. The technique is applied to measure the effect of maternal smoking on birth weight.
Permutt
T
T
Department of Epidemiology and Preventive Medicine, University of Maryland School of Medicine, Baltimore 21201.
Hebel
J R
JR
D001699:Biometry / Q000379:methods*; D001724:Birth Weight; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D012907:Smoking / Q000009:adverse effects* / Q000453:epidemiology; D000074606:Smoking Prevention