Nutritional status and risk factors of overweight and obesity for children aged 9–15 years in Chengdu, Southwest China

Table 2 Comparisons of parental income, living space, birth categories and family history of ORD between cases and controls

Variables		Cases (n = 1,282),% or median with 95% CI	Controls (n = 2,586),% or median with 95% CI	χ²	P
Parental income (RMB/year)^A	< 20,000	11.7	10.0	7.903	0.095
	20,000-50,000	25.2	25.3
	50,000-100,000	34.9	38.4
	100,000-20,000	19.7	19.4
	≥ 200,000	8.5	6.9
Living space (m²)^B		110.3 (107.7, 110.9)	107.0 (105.4, 108.6)	/	0.202
Aberrant birth categories ^A	Preterm SGA	0.3	0.2	29.707	0.000*
	Preterm AGA	3.7	2.7
	Preterm LGA	0.8	0.3
	Full term SGA	6.5	5.1
	Full term AGA	63.4	71.6
	Full term LGA	23.9	18.9
	Post-term SGA	0.23	0.15
	Post-term AGA	0.9	0.8
	Post-term LGA	0.23	0.19
Immediate family members with history of obesity related disease ^A	Father	42.5	30.7	52.798	0.000*
	Mather	20.8	13.3	36.483	0.000*
	Paternal grandfather	42.7	38.5	6.396	0.011*
	Paternal grandmother	49.8	40.5	30.261	0.000*
	Maternal grandfather	43.2	39.8	4.153	0.042*
	Maternal grandmother	47.7	40.8	16.466	0.000*

Note. A referred toχ² test, and B referred to nonparametric Mann–Whitney U test; *P <0.05, statistically significant difference. Parental educational level and career with P>0.1 were not listed in this table due to wide space to occupy.

ISSN: 1471-2458