Table I.

Table showing subject numbers by age, at three time points and percentage of subjects that recorded a ‘yes’ response to having achieved menarche.

Age	Age centre	1989		2000		2008
		Number of subjects (n = 239)	% Yes	Number of subjects (n = 346)	% Yes	Number of subjects (n = 339)	% Yes
10	10.5	33	0	39	0	30	3
11	11.5	32	3	32	0	40	3
12	12.5	23	0	54	5	39	8
13	13.5	28	0	35	8	27	11
14	14.5	29	14	41	33	30	40
15	15.5	25	32	30	52	26	69
16	16.5	23	57	35	91	44	84
17	17.5	18	89	32	100	27	89
18	18.5	12	100	20	100	14	88
19	19.5	8	100	17	100	18	100
20	20.5	8	100	11	100	14	100