Table 3

The mean (SD) age, BMI, and BMI-SDS for premenarcheal and postmenarcheal girls, in four age groups

	n	Age	BMI	BMI-SDS	p Value
11–12 years
Premenarche	293	11.5	17.6 (2.8)	−0.15 (1.1)	< 0.001
Postmenarche	20	11.6	20.4 (2.7)	0.90 (0.8)
12–13 years
Premenarche	218	12.5	18.0 (2.8)	−0.25 (1.1)	< 0.001
Postmenarche	89	12.6	20.0 (2.6)	0.55 (0.8)
13–14 years
Premenarche	132	13.4	17.9 (2.2)	−0.55 (1.0)	< 0.001
Postmenarche	213	13.5	20.0 (2.6)	0.29 (0.9)
14–15 years
Premenarche	50	14.4	18.5 (2.1)	−0.59 (1.0)	< 0.001
Postmenarche	261	14.5	20.3 (2.5)	0.19 (0.8)