Characteristics and consumption of food groups by cases and controls
| Cases(n = 515) | Controls(n = 515) | |
|---|---|---|
| Figures are mean (SD), median (IQR), or percentage (number) as indicated. | ||
| BMI, body mass index; FEV1, forced expiratory volume in 1 second; ex-smokers, people who reported ever smoking >1 pack year of cigarettes; vitamin C supplements, self-reported taking of vitamin supplements know to contain vitamin C in the food diary. | ||
| *Total pack years smoked by ex-smokers. | ||
| †p<0.05, ‡p⩽0.001, difference between cases and controls. | ||
| Men, % (n) | 32.6 (168) | 32.6 (168) |
| Mean (SD) age (years) | 58.5 (8.7) | 58.4 (8.6) |
| Mean (SD) BMI (kg/m2) | 26.2 (3.8) | 25.9 (3.7) |
| Ex-smokers, % (n) | 24.1 (124)‡ | 29.1 (150)‡ |
| Pack years* | 7.0 (11.0) | 9.0 (15.4) |
| Mean (SD) FEV1 (l) | 2.12 (0.69)‡ | 2.62 (0.61)‡ |
| Social class, % (n) | ||
| I | 8.9 (45) | 6.9 (35) |
| II | 41 (208) | 37.9 (191) |
| III | 34.5 (175) | 41.1 (207) |
| IV | 11.1 (56) | 10.9 (55) |
| V | 4.5 (23) | 3.2 (16) |
| Vitamin C supplements, % (n) | 14.0 (72) | 10.9 (56) |
| Median (IQR) fruit (g/day) | 132.1 (145.2)† | 149.1 (138.5)† |
| Median (IQR) vegetables (g/day) | 96.9 (81.7) | 96.6 (81.8) |
| Median (IQR) cereals (g/day) | 30.0 (45.0) | 28.1 (46.6) |
| Median (IQR) fish (g/day) | 30.4 (38.3) | 28.6 (30.5) |
| Median (IQR) dairy products(g/day) | 249.8 (196.4) | 265.9 (207.7) |
| Median (IQR) meat (g/day) | 115.8 (88.1) | 107.2 (72.4) |
| Median (IQR) pulses/beans/lentils (g/day) | 22.4 (33.4) | 21.8 (36.8) |
| Mean (SD) total energy (kJ) | 7895 (2158) | 7904 (1987) |