Age (wk) No. 2.5 5 10 25 50 75 90 95 97.5 16 6 6.4 7.0 8.0 9.1 10.3 11.3 11.9 12.4 8.9 10.0 11.2 12.2 12.8 13.3 22 6.8 8.2 8.8 9.8 1 '1.0 12.1 13.1 13.7 14.2 19 21 8.6 9.7 10.7 11.9 13.0 14.0 14.6 15.1 20 20 9.6 10.0 10.6 11.7 12.8 13.9 15.0 15.5 16.0 30 10.4 11.0 11.6 12.6 13.7 14.8 15.8 16.4 16.9 18 11.3 11.9 12.5 13.5 14.6 15.7 16.7 17.3 17.8 12.2 12.8 13.4 14.4 15.5 16.6 17.6 18.2 18.8 27 13.2 13.7 14.3 15.3 16.4 17.5 18.5 19.1 19.7 20 14.1 14.6 15.2 16.2 17.3 18.4 19.4 20.0 20.6 25 15.0 15.5 16.1 17.1 18.2 19.3 21n.0 21n.5 27 24 15.9 16.4 17.0 18.0 19.1 20.2 21.3 21.9 22.4 24 16.8 17.3 18.9 20.0 21.2 22.2 22.8 23.3 24 17.7 18.2 18.8 19.8 21.0 22.1 23.1 23.7 24.2 18.6 19.1 19.7 21n.9 23.0 24.0 24.6 25.1 24 19.5 20.0 20.6 21.6 22.8 23.9 24.9 25.5 26.0 20.9 32 28 21n.5 22.6 23.7 24.8 25.8 26.4 26.9 21.3 21.8 22.5 23.5 24.6 25.7 27.3 27.8 28.2 28.722.2 22.8 23.4 24.4 25.5 26.6 27.6 20 23.1 23.7 24.3 25.3 26.4 27.5 28.5 29.1 29.6 23 24.0 24.6 25.2 26.2 27.3 28.4 29.4 30.0 30.6 37 22 24.8 25.5 26.1 27.1 28.2 29.3 30.3 30.9 31.5 25.9 26.4 27.0 28.0 29.1 30.2 31.2 31.9 32.4 39 7 26.8 27.3 27.9 30.0 31.1 32.2 32.8 33.3 6 27.7 28.2 28.8 29.8 30.9 32.1 33.1 33.7 34.2