[Case-control study on effect of passive smoking during different pregnancy term on small-for-gestational-age infants at term].
OBJECTIVE
To analyze the effect of passive smoking during different pregnancy term to infant birth weight.


METHODS
155 women which infants were singleton term small-for-gestational-age infant (SGA) -cases and 155 with singleton term non-SGA controls matched by infant sex, infant birthday ( +/-10 days) and maternal age ( < 20 years, 20- 35 years and > or = 35 years) were interviewed. Single and multiple analyses were performed by conditional logistic regression.


RESULTS
Passive smoking during the second, the third or the whole term of pregnancy was significantly associated with risk of term SGA (P < 0.05). The odds ratios of these risk factors were 3.07, 2.94 and 3.42 respectively. Passive smoking during the first term of the pregnancy was not associated with risk of term SGA ( P > 0.05) .


CONCLUSIONS
Decreasing passive smoking during the second or the third term of pregnancy maybe benefits to lower the risk of term SGA.
Han
Jing-xiu
JX
Institute for Environment Hygiene and Health Related Product Safety, Chinese Center for Disease Control and Prevention, Beijing 100021, China.
Gan
De-kun
DK
Zhai
Gui-rong
GR
Shi
Ying
Y
D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age; D016015:Logistic Models; D008297:Male; D018811:Maternal Exposure / Q000009:adverse effects*; D011247:Pregnancy; D012307:Risk Factors; D014028:Tobacco Smoke Pollution / Q000009:adverse effects*
D014028:Tobacco Smoke Pollution