| Year before study | Year of study | ||||
---|---|---|---|---|---|---|
 | Intervention | Control | External control | Intervention | Control | External control |
Number of users | 271 | 169 | 524 | 341 | 163 | 498 |
Age in years mean (SD) | 36.1 (12.7) | 36.2 (12.1) | 36.0 (12.8) | 35.8 (12.0) | 38.0 (14.1) | 35.5 (12.0) |
Ethnicity n (%) | Â | Â | Â | Â | Â | Â |
   Bangladeshi | 68 (25.1) | 42 (24.9) | 121 (23.1) | 67 (19.6) | 35 (21.5) | 131 (26.3) |
   Pakistani | 203 (74.9) | 127 (75.1) | 403 (76.9) | 274 (80.4) | 128 (78.5) | 367 (73.7) |