Average age (months over 12 years) 6.0 5.7 5.8 5.3 6.4 6.0 6.3 4.7 5.4 4.8 Average stature.. 139.9 141.1 140.2 139.2 140.6 139.7 139.1 137.9 139.6 140.6 Corrected average for 12 years, 6 months 139.9 141.2 140.3 139.5 140.4 139.7 139.0 138.5 139.9 141.1 |