The prevalence of obesity and influence of early life and behavioral factors on obesity in Chinese children in Guangzhou

Table 3 Associations of early life factors with overweight/obesity

Early life factors	Overweight		Obese
Early life factors	Crude model	Adjusted model^a	Crude model	Adjusted model^a
Birth weight (reference: 2.5 ~ 4.0 kg)
< 2.5 kg	0.51 (0.26, 1.02)	0.49 (0.23, 1.01)	0.61 (0.30, 1.25)	0.68 (0.32, 1.43)
≥ 4.0 kg	1.49 (0.95, 2.33)	1.42 (0.89, 2.26)	2.64 (1.78, 3.92) ^**	2.34 (1.53, 3.58) ^**
Mode of delivery (reference: vaginal delivery)
Cesarean delivery	1.19 (0.94, 1.50)	1.17 (0.92, 1.50)	1.17 (0.91, 1.50)	1.18 (0.90, 1.55)
Gestational age (reference: 37 ~ 42 weeks)
< 37 weeks	1.96 (1.15, 3.33) ^*	1.75 (1.01, 3.05) ^*	1.71 (0.95, 3.08)	1.34 (0.71, 2.54)
≥ 42 weeks	1.67 (0.75, 3.72)	1.39 (0.58, 3.30)	0.81 (0.28, 2.38)	0.59 (0.17, 2.04)
Feeding patterns (reference: not breastfeeding)
Breastfeeding	1.08 (0.75, 1.56)	1.06 (0.72, 1.57)	0.98 (0.66, 1.47)	1.12 (0.73, 1.72)
Breastfeeding duration (reference: < 4.0 months)
4.0 ~ 5.9 months	0.66 (0.43, 1.03)	0.68 (0.43, 1.08)	0.61 (0.37, 1.00) ^*	0.62 (0.37, 1.03)
6.0 ~ 7.9 months	0.94 (0.65, 1.37)	1.01 (0.68, 1.50)	0.93 (0.62, 1.40)	0.93 (0.60, 1.43)
≥ 8.0 months	0.88 (0.61, 1.25)	0.87 (0.60, 1.27)	1.14 (0.78, 1.65)	1.04 (0.70, 1.55)

Bold text: OR was significant at 0.05 level
Values were represented as OR and 95 % CIs derived from multinomial logistic regression analyses. The reference level for dependent variable was “normal weight”, which excluded the underweight children
^aAdjusted for age, gender, only child or not, paternal and maternal educational level, paternal and maternal occupation and monthly household income
^* P < 0.05; ^** P < 0.01

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