. 2011 Feb 26;22(10):2689–2698. doi: 10.1007/s00198-011-1531-3

Table 2.

Regressions between Z-scores of body mass index (BMI) and menarcheal age (A) and between delta Z-scores of BMI and menarcheal age (B)

	N	β	P	95% CI for		R ²
	N	β	P	Lower	Upper	R ²
A)
Age (year/s)
Birth	115	−0.070	0.468	−0.259	0.120	0.01
1	96	−0.026	0.804	−0.237	0.184	0.01
7.9	124	−0.336	0.000	−0.505	−0.167	0.11
8.9	123	−0.337	0.000	−0.506	−0.169	0.11
10.0	114	−0.341	0.000	−0.515	−0.166	0.12
12.4	105	−0.455	0.000	−0.644	−0.265	0.18
16.4	113	−0.327	0.001	−0.510	−0.137	0.10
16.4	113	−0.327	(0.001)^a	−0.510	−0.137	0.10
20.4	124	−0.208	0.020	−0.383	−0.033	0.04
20.4	124	−0.208	(0.018)^a	−0.383	−0.033	0.04
B)
Delta age (years)
Birth to 1	96	−0.048	0.734	−0.328	0.232	0.01
1 to 7.9	96	−0.245	0.058	−0.499	0.009	0.04
1 to 8.9	96	−0.260	0.050	−0.519	0.000	0.04
1 to 10.0	92	−0.356	0.010	−0.624	−0.088	0.07
1 to 12.4	88	−0.417	0.006	−0.710	−0.123	0.08
1 to 16.4	92	−0.199	0.268	−0.553	0.156	0.01
1 to 16.4	92	−0.199	(0.089)^a	−0.553	0.156	0.01
1 to 20.4	96	−0.167	0.243	−0.448	0.115	0.02
1 to 20.4	96	−0.167	(0.076)^a	−0.448	0.115	0.02

CI confidence interval

^aAfter adjustment for smoking and contraceptive pill use