Table 1.

Baseline Characteristics

Variable	All (n = 3014)		Males (n = 1542)		Females (n = 1472)
	Mean or Percentage	SD	Mean or Percentage	SD	Mean or Percentage	SD
BMI age 7 (kg/m2)	16.1	1.89	16.0	1.76	16.3	2.09
Height age 7 (cm)	126.1	5.61	126.5	5.56	125.7	5.64
Weight age 7 (kg)	25.8	4.34	25.7	4.16	25.9	4.51
Fat mass measured by DXA (kg)	8.26	4.77	7.10	4.53	9.46	4.71
Body fat percentage (fat mass [kg]/weight [kg]) × 100a	22.6	8.69	19.4	18.26	25.9	7.87
Lean mass measured by DXA (kg)	24.7	3.11	25.6	2.89	23.7	3.05
Age at DXA assessment (mo)	90.3	3.92
Age 7 FT3 (pmol/L)	6.28	0.62	6.22	0.62	6.34	0.62
Age 7 FT4 (pmol/L)	15.7	1.66	15.5	1.58	15.9	1.71
Age 7 TSH (mU/L)	2.28	0.91	2.36	0.90	2.20	0.90
Age 15 FT3 (pmol/L)	5.84	0.74	6.19	0.69	5.50	0.63
Age 15 FT4 (pmol/L)	15.4	1.90	15.4	1.98	15.4	1.84
Age 15 TSH (mU/L)	2.33	1.00	2.43	1.05	2.24	0.93
Family adversity indexb	3.71	4.45	3.73	3.87	3.69	3.80
Home scorec
0–4 (%)	3.47		2.77		4.21
5–8 (%)	23.9		23.2		24.6
9–12 (%)	72.7		74.1		71.2
Housing statusd
Owned/mortgaged (%)	85.6		85.6		85.6
Privately rented (%)	11.0		11.8		10.2
Council rented/other (%)	3.3		2.7		4.0
Maternal age at childbirth (y)	29.4	4.2	29.5	4.5	29.4	4.3
Maternal highest educational statuse
Low (%)	18.4		19.3		17.4
Middle (%)	34.8		35.5		34.1
High (%)	46.8		45.2		48.5
Maternal smoking in pregnancyf
None (%)	84.5		84.3		84.7
Some (%)	15.5		15.7		15.2
Parityg
0–1 (%)	82.1		80.9		83.4
2–4 (%)	17.9		18.7		16.6
>5 (%)	0.2		0.28		0.07

% are expressed as column %.

^aTwo children with missing data for weight at age 9.

^bA total of 323 children with missing data.

^cA total of 277 children with missing data.

^dA total of 215 children with missing data.

^eA total of 224 children with missing data.

^fA total of 201 children with missing data.

^gA total of 226 children with missing data.