[The influence of high birth weight on the blood pressure during childhood - a cohort study].

Objective: To explore the effects of high birth weight (HBW) on blood pressure (BP) during childhood.

Methods: A total of 1435 couples with high or normal birth weight were selected from a birth cohort who were born between 1993 and 1995 in Wuxi, China and, followed between 2005 and 2007. A questionnaire survey was conducted, with their height, weight and blood pressure measured.

Results: The medians of systolic blood pressure (SBP) and diastolic BP (DBP) of HBW group were 100 mm Hg (Q(1)-Q(3): 90 - 110 mm Hg), 64 mm Hg (Q(1)-Q(3): 60 - 70 mm Hg) in the high birth weight group, respectively, while they were 100 mm Hg (Q(1)-Q(3): 90 - 108 mm Hg), 62 mm Hg (Q(1)-Q(3): 60 - 70 mm Hg) in the normal weight group. No statistical significant difference was found between the exposed and unexposed groups. The proportion of elevated BP, including pre-hypertension and hypertension, in exposed group was 13.66%, a bit higher than that (11.57%) of the unexposed group (P = 0.055). The relative risk (RR) of HBW on elevated BP was 1.06 (0.92 - 1.21), after adjusted the following parameters as BMI in childhood, sex, age during the follow-up period, age of mother at delivery, gestational age, type of feeding at infancy, dietary habit as well as the frequencies of exercise during childhood.

Conclusion: No statistically significant correlation was found between high birth weight and blood pressure of children.