Table 1 Demographics of the sample, overall and by sex
Demographic characteristics | Sample Population n = 318 (%) | Male n = 80 (%) | Female n = 238(%) | Chi2 P Value |
|---|---|---|---|---|
Age: Median (IQR) | 39 (34–45) | 42 (37–47) | 39 (33–44) | < 0.001 c |
 25–34 | 82 (26) | 14 (18) | 68 (28) | 0.07 |
 35–44 | 145 (46) | 35 (43) | 110 (46) |  |
 45–54 | 65 (20) | 23 (29) | 42 (18) |  |
 54 > | 26 (8) | 8 (10) | 18 (8) |  |
BMI: (n = 316; inc. 79 males) | 28 (23–32) | 22 (19–26) | 29 (25–34) | < 0.001 c |
Median (IQR) | ||||
 Underweight | 20 (6) | 12 (15) | 8 (3) | < 0.001 |
 Normal | 96 (30) | 43 (55) | 53 (22) |  |
 Overweight | 85 (28) | 16 (20) | 69 (30) |  |
 Obese | 115 (36) | 8 (10) | 107 (45) |  |
Smoker | ||||
 Yes currently | 50 (16) | 40 (50) | 10 (4) | < 0.001 |
 Ex-smoker | 23 (7) | 11 (14) | 12 (5) |  |
 Never | 245 (77) | 29 (36) | 216 (91) |  |
Pack years amongst ever smokers: median (IQR) | 3 (1–6) | 4 (1–7) | 1 (0–2) | < 0.001 c |