Boys with height and weight records by school year and those within specified ranges of BMI
| School year | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1986/87 | 1987/88 | 1988/89 | 1989/90 | 1990/91 | 1991/92 | 1992/93 | 1993/94 | 1994/95 | 1995/96 | 1996/97 | 1997/98 | 1998/99 | 1999/00 | 2000/01 | 2001/02 | |
| No. on system | 1640 | 1719 | 1406 | 1625 | 1261 | 1241 | 1197 | 1352 | 98 | 2101 | 1904 | 1888 | 1815 | 1775 | 1966 | 2062 |
| Records of sex, weight, and height (%) | 1611 (98.2) | 1674 (97.4) | 1342 (95.5) | 1521 (93.6) | 1117 (88.6) | 1114 (89.8) | 1117 (93.2) | 1248 (92.3) | 43 (43.8) | 2056 (97.9) | 1882 (98.8) | 1864 (98.7) | 1770 (97.5) | 1749 (98.5) | 1816 (92.3) | 1770 (85.8) |
| Outside plausible range of BMI | 17 | 23 | 106 | 78 | 7 | 194 | 5 | 5 | 3 | 399 | 248 | 135 | 818 | 715 | 399 | 1 |
| No. of corrections made (see text) | 11 | 13 | 99 | 73 | 4 | 173 | 4 | 3 | 3 | 384 | 226 | 130 | 676 | 713 | 327 | 0 |
| No. (and %) with usable sex, height, and weight entries | 1605 (97.8) | 1664 (96.8) | 1335 (94.9) | 1516 (93.3) | 1114 (88.3) | 1093 (88.1) | 1116 (93.2) | 1246 (92.1) | 43 (43.8) | 2041 (97.1) | 1860 (97.7) | 1859 (98.5) | 1628 (89.7) | 1747 (98.4) | 1744 (88.7) | 1769 (85.8) |
| Mean age (years) | 5.1 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 | 5.0 | 5.0 | 4.9 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.1 |
| Mean height (cm) | 109.2 | 109.0 | 108.7 | 109.1 | 109.4 | 109.2 | 108.8 | 108.8 | 108.4 | 110.1 | 109.6 | 109.9 | 110.7 | 111.0 | 109.9 | 110.0 |
| Mean weight (kg) | 18.9 | 18.9 | 18.8 | 19.2 | 19.2 | 19.1 | 18.9 | 18.9 | 18.5 | 19.5 | 19.4 | 19.7 | 19.8 | 19.6 | 19.4 | 19.7 |
| Mean BMI (kg/m2) | 15.8 | 15.9 | 15.9 | 16.1 | 16.0 | 16.0 | 15.9 | 15.9 | 15.7 | 16.0 | 16.1 | 16.3 | 16.1 | 16.1 | 16.0 | 16.2 |