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采用双盲法对465例足月正常新生儿进行20项行为神经测定（NBNA）及孕母是否被动吸烟和胎儿体格发育进行调查，二组间孕母及新生儿的情况及影响因素无差异，说明不论孕母是否被动吸烟，对胎儿体格发育（除体重外）受到均匀的影响。父亲吸烟支数与母亲被动吸烟小时数成正比，有显著差异。NBNA减分率被动吸烟组校对照组高0．11％；七项加分法，被动吸烟组加分率较对照组低6．44％，均有显著差异。被动吸烟对NBNA的影响主要表现在主、被动肌张力、踏步和行为改变。
Double-blind method was used to investigate 20 behavioral neurological tests (NBNA) of 465 full-term normal newborns and whether pregnant women were passive smoking and fetal physical development. There was no difference between the two groups in the situation and influencing factors of pregnant mothers and newborns, Shows that regardless of mothers are passive smoking, physical development of the fetus (except body weight) are evenly affected. There was a significant difference between the number of smoking cigarettes and the number of mothers passive smoking hours. NBNA reduction rate of passive smoking school control group was 0.11% higher; seven plus points, passive smoking group score was 6.44% lower than the control group, were significantly different. Passive smoking on the impact of NBNA mainly in the main, passive muscle tension, stepping and behavioral changes.