[Influence of stress from work and negative life events during pregnancy on different types of low birth weight].

Objective: To explore the influence of occupational stress and negative life events that occur during pregnancy on different types of low birth weight (LBW).

Methods: 438 singleton LBW infants (birth weight of less than 2500 g and their pregnancy term from 28 to 42 weeks) were selected as case group, and they were further divided into symmetric LBW infants (337 cases) and asymmetric LBW infants (101 cases). According to situation of each LBW infant, a singleton with full term and normal birth weight was selected as control group matched by sex, pregnancy term, time during delivery and types of hospital.