Table 2 Percentage of Girls in the Examined Pubertal Stage, by Age
From: Urinary bisphenol A and pubertal development in Chinese school-aged girls: a cross-sectional study
Age | Menstrual | B2+ | B5 | PH2+ | PH5 |
|---|---|---|---|---|---|
n(%) | n(%) | n(%) | n(%) | n(%) | |
9 | 3(3.9) | 60(76.0) | 0(0.0) | 4(5.0) | 0(0.0) |
10 | 2(2.5) | 75(90.4) | 0(0.0) | 10(12.2) | 0(0.0) |
11 | 25(31.3) | 78(97.5) | 3(3.8) | 35(43.8) | 0(0.0) |
12 | 51(64.6) | 80(100.0) | 12(15.0) | 74(92.5) | 0(0.0) |
13 | 51(78.5) | 65(100.0) | 19(29.2) | 63(96.9) | 7(10.8) |
14 | 59(100.0) | 59(100.0) | 18(30.5) | 59(100.0) | 6(10.2) |
15 | 63(100.0) | 63(100.0) | 26(41.3) | 63(100.0) | 20(31.8) |
16 | 74(100.0) | 73(100.0) | 32(43.8) | 73(100.0) | 22(30.1) |
17 | 63(100.0) | 63(100.0) | 43(68.3) | 63(100.0) | 27(42.9) |
18 | 9(100.0) | 9(100.0) | 7(77.8) | 9(100.0) | 5(55.6) |