Table 4 Percentages of those who changed their frequency of physical activity or diet from 1991 (33 y) to 1999 (41 y) by social class, qualifications and BMI
From: Changes in diet and physical activity in the 1990s in a large British sample (1958 birth cohort)
 |  |  | Activity | Chips | Fried food | Fruit and salad | ||||
---|---|---|---|---|---|---|---|---|---|---|
 |  | aN 100% | Increased nb=1281 (m) 1472 (f) | Decreased nb=1377 (m) 1512 (f) | Increased nb=733 (m) 845 (f) | Decreased nb=1469 (m) 1448 (f) | Increased nb=1365 (m) 1590 (f) | Decreased nb=1341 (m) 1276 (f) | Increased nb=1349 (m) 1426 (f) | Decreased nb=1003 (m) 1206 (f) |
Social class c | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
Males | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 I and II |  | 845 | 31 | 27 | 18 | 29 | 37 | 24 | 33 | 19 |
 III NM |  | 457 | 29 | 32 | 15 | 34 | 35 | 27 | 29 | 23 |
 III M |  | 2143 | 29 | 34 | 17 | 33 | 29 | 32 | 31 | 23 |
 IV and V |  | 930 | 29 | 30 | 15 | 38 | 28 | 34 | 29 | 27 |
 | P d |  | 0.84 | 0.01 | 0.55 | 0.007 | 0.02 | 0.02 | 0.70 | 0.004 |
Females | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 I and II |  | 850 | 32 | 32 | 22 | 21 | 45 | 17 | 31 | 24 |
 III NM |  | 464 | 29 | 32 | 20 | 30 | 33 | 23 | 30 | 27 |
 III M |  | 2335 | 32 | 32 | 16 | 32 | 32 | 29 | 30 | 25 |
 IV and V |  | 1071 | 31 | 33 | 17 | 35 | 29 | 32 | 30 | 28 |
 | P d |  | 0.50 | 0.64 | 0.26 | <0.0001 | <0.0001 | <0.0001 | 0.99 | 0.23 |
Education e | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 Males |  |  |  |  |  |  |  |  |  |  |
 Higher |  | 1394 | 29 | 31 | 18 | 29 | 40 | 21 | 33 | 18 |
 A level |  | 1138 | 31 | 33 | 16 | 35 | 30 | 30 | 34 | 21 |
 O level |  | 1130 | 28 | 33 | 17 | 35 | 29 | 34 | 30 | 26 |
 <O level |  | 583 | 29 | 32 | 14 | 38 | 23 | 39 | 25 | 31 |
 None |  | 358 | 30 | 26 | 20 | 34 | 24 | 43 | 27 | 27 |
 | P d |  | 0.48 | 0.07 | 0.33 | 0.004 | <0.0001 | <0.0001 | 0.20 | <0.0001 |
Females | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 Higher |  | 1318 | 30 | 33 | 19 | 23 | 44 | 16 | 31 | 21 |
 A level |  | 534 | 34 | 29 | 20 | 26 | 39 | 24 | 29 | 26 |
 O level |  | 1827 | 33 | 33 | 16 | 33 | 31 | 29 | 31 | 26 |
 <O level |  | 820 | 30 | 31 | 15 | 34 | 26 | 35 | 28 | 28 |
 None |  | 470 | 26 | 35 | 21 | 37 | 23 | 40 | 30 | 28 |
 | P d |  | 0.05 | 0.25 | 0.01 | <0.0001 | <0.0001 | <0.0001 | 0.62 | 0.003 |
BMI f | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
Males | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 1st quartile |  | 1155 | 29 | 30 | 17 | 33 | 33 | 29 | 30 | 22 |
 2nd quartile |  | 1179 | 28 | 34 | 16 | 31 | 33 | 28 | 32 | 22 |
 3rd quartile |  | 1159 | 31 | 30 | 18 | 34 | 31 | 29 | 30 | 24 |
 4th quartile |  | 1147 | 29 | 32 | 16 | 36 | 28 | 36 | 31 | 24 |
 | P d |  | 0.44 | 0.24 | 0.28 | 0.04 | 0.25 | 0.01 | 0.80 | 0.29 |
Females | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 1st quartile |  | 1185 | 31 | 32 | 18 | 26 | 39 | 23 | 30 | 23 |
 2nd quartile |  | 1184 | 32 | 32 | 17 | 32 | 35 | 26 | 32 | 25 |
 3rd quartile |  | 1196 | 32 | 32 | 18 | 30 | 32 | 30 | 29 | 25 |
 4th quartile |  | 1177 | 30 | 32 | 19 | 34 | 29 | 30 | 29 | 28 |
 | P d |  | 0.71 | 0.95 | 0.25 | <0.0001 | 0.001 | 0.12 | 0.27 | 0.03 |