Table 1. Descriptive characteristics of school aged children (5-10 yrs) participating in the Health Survey for England between 1997 and 2007.
| Mean(SD)or % | |||||
|---|---|---|---|---|---|
| 1997/8 | 2000/1 | 2002/3 | 2004/5 | 2006/7 | |
| N (core) | 4147 | 1863 | 3579 | 1323 | 4359 |
| N (SEP analyses) | 3919 | 1640 | 3229 | 1164 | 3697 |
| Mean Age | |||||
| Boys | 7.5 (1.7) | 7.5 (1.7) | 7.5 (1.7) | 7.6 (1.7) | 7.6 (1.7) |
| Girls | 7.5 (1.7) | 7.5 (1.7) | 7.5 (1.7) | 7.5 (1.8) | 7.6 (1.7) |
| Age group (%) | |||||
| 5-7 years | 50 | 50 | 50 | 50 | 48 |
| 8-10 years | 50 | 50 | 50 | 50 | 52 |
| Mean BMI | |||||
| Boys | 16.7 (2.2) | 17.0 (2.4) | 17.0 (2.5) | 17.2 (2.7) | 17.1 (2.6) |
| Girls | 16.9 (2.4) | 17.1 (2.7) | 17.3 (2.8) | 17.3 (2.9) | 17.2 (2.7) |
| Household income (GB Pounds) | 16,010 (14,458) | 20,826 (18,048) | 22,546 (19,636) | 23,633 (20,007) | 25,560 (21,384) |
| Social class (% manual households) | 52 | 46 | 44 | 42 | 40 |
| Missing BMI data, % (N )* | 2.0 (85) | 10.5 (218) | 8.0 (311) | 13.9 (213) | 10.7 (523) |
| Missing social class data , % (N ) | 3.3 (138) | 4.3 (80) | 3.4 (122) | 3.8 (50) | 3.5 (153) |
| Missing household income data , % (N ) | 2.3 (92) | 8.4 (156) | 6.7 (241) | 8.6 (114) | 12.3 (538) |
*
Omitted from all analyses