Table 4.

Total AL and AL values stratified by sex and age

Age (N)	AL (mm)			t	P value
	Total	Boys	Girls
3 (159)	21.93 ± 0.62	22.15 ± 0.60	21.71 ± 0.56	4.852	< 0.001**
4 (235)	22.33 ± 0.65	22.55 ± 0.63	22.00 ± 0.53	6.972	< 0.001**
5 (234)	22.41 ± 0.66	22.68 ± 0.60	22.09 ± 0.59	7.628	< 0.001**
6 (2304)	22.64 ± 0.72	22.90 ± 0.71	22.37 ± 0.63	18.993	< 0.001**
7 (2936)	22.95 ± 0.77	23.21 ± 0.73	22.65 ± 0.71	21.086	< 0.001**
8 (2621)	23.25 ± 0.83	23.51 ± 0.79	22.97 ± 0.78	17.824	< 0.001**
9 (2431)	23.54 ± 0.91	23.79 ± 0.86	23.28 ± 0.89	14.261	< 0.001**
10 (2336)	23.84 ± 1.01	24.10 ± 0.96	23.57 ± 0.98	13.076	< 0.001**
11 (2210)	24.05 ± 1.05	24.29 ± 1.04	23.78 ± 1.00	11.666	< 0.001**
12 (1623)	24.24 ± 1.12	24.46 ± 1.15	23.99 ± 1.03	8.615	< 0.001**
13 (1429)	24.40 ± 1.14	24.69 ± 1.12	24.09 ± 1.08	10.408	< 0.001**
14 (937)	24.64 ± 1.25	24.86 ± 1.28	24.40 ± 1.16	5.808	< 0.001**

N: number, mm: millimetres, **represented P < 0.001