Table 1. Characteristics of participants and their mothers’ by gender.

			Boys			Girls			All
			( n (max) = 585 )			( n (max) = 522 )			( n (max) = 1107 )
		n	Mean	SD	n	Mean	SD	n	Mean	SD
Child characteristics
Birth weight (g)		578	3565.6	538.5	521	3402.2	543.4	1099	3488.1	546.7
Weight at 4 year (kg)		302	17.5	2.1	251	17.5	2.4	553	17.5	2.2
Weight at 6 year (kg)		363	24.1	3.7	333	24.3	4.5	696	24.2	4.1
Crown-heel length at birth (cm)		568	50.4	2.1	510	49.5	2.1	1078	49.9	2.2
Height at 4 year DXA (cm)		302	104.1	3.7	253	103.9	4.1	555	104	3.9
Height at 6 year DXA (cm)		365	122	5.1	334	121.3	5.7	699	121.6	5.4
Mothers characteristics
Mother’s height (cm)		576	163.2	7.1	512	162.7	6.9	1088	163	7
		n	Median	Interquartile range		Median	Interquartile range	n	Median	Interquartile range
Mother’s weight (kg)		500	57.2	52.2-63.6	438	56.7	50.8-61.2	938	57	50.8-63.0
Pre-pregnancy BMI		578	24.7	22.3-27.7	519	24.1	22.0-27.2	1097	24.4	22.1-27.5
Frequency of strenuous exercise per week		583	0.3	0.0-1.5	519	0.3	0.0-1.5	1102	0.3	0.0-1.5
Smoking status before pregnancy		n	%		n	%		n	%
	No	434	74.2		367	70.3		801	72.4
	Yes	151	25.8		155	29.7		306	27.6