Table 1.
Baseline characteristics of cohort
| Characteristic | Males, N = 51 986 | Females, N = 70 487 |
|---|---|---|
| Mean age, years, (SD) | 41 (20.1) | 41 (19.0) |
|
| ||
| Follow-up time, person-years | 302 257 | 416 556 |
|
| ||
| Townsend score, n (%)a | ||
| 1 (least deprived) | 12 582 (24.5) | 15 991 (23.0) |
| 2 | 10 554 (20.6) | 13 768 (19.8) |
| 3 | 10 482 (20.4) | 14 465 (20.8) |
| 4 | 10 024 (19.5) | 14 167 (20.4) |
| 5 (most deprived) | 7714 (15.0) | 11 195 (16.1) |
| Not recorded | 630 (1.2) | 901 (1.3) |
|
| ||
| Body mass index, n (%)b | ||
| Mean (SD) | 27.3 (5.3) | 28.0 (6.7) |
| Not recorded | 7979/46 438 (17.2) | 4977/64 245 (7.8) |
|
| ||
| Diabetes, Yes, n (%) | 6260 (12.0) | 8128 (11.5) |
|
| ||
| Skin condition, Yes, n (%) | 8568 (16.5) | 14236 (20.2) |
|
| ||
| Hidradenitis suppurativa, n (%) | 429 (0.83) | 1751 (2.5) |
|
| ||
| Steroid prescription, n (%) | 1231 (2.4) | 2221 (3.2) |
|
| ||
| Antibiotics in prior 6 months, n (%) | ||
| 1 course | 9806 (18.9) | 16 820 (23.9) |
| >1 course | 2670 (5.2) | 5020 (7.1) |
|
| ||
| Smoking status, n (%)b | ||
| Non-smoker | 9841 (22.9) | 16 259 (26.3) |
| Current smoker | 15 225 (35.4) | 20 529 (33.2) |
| Ex-smoker | 17 934 (41.7) | 25 035 (40.5) |
| Not recorded | 3438 (7.4) | 2422 (3.8) |
a
In the full THIN dataset 27% of the population are in Q1, 22% Q2, 21% Q3, 18% Q4, 12% Q5.
b
BMI and smoking status only included for adults aged ≥ 16 years. BMI = body mass index. Q = quintile. SD = standard deviation.