From: Pooling data for Number Needed to Treat: no problems for apples
 |  | Number quitting/total | Percent quitting (95% CI) |  |  | ||
---|---|---|---|---|---|---|---|
Setting | Number of studies | Intervention | Control | Intervention | Control | Relative benefit (95% CI) | NNT (95% CI) |
Hospital | 7 | 435/1367 | 318/1295 | 32 (30 to 34) | 25 (23 to 27) | 1.3 (1.1 to 1.6) | 14 (9 to 26) |
Primary care | 3 | 111/2453 | 41/1006 | 4.5 (3.7 to 5.3) | 4.1 (2.9 to 5.3) | 0.8 (0.3 to 2.6) | 222 (52 to -98) |
Combined | 10 | 546/3820 | 359/2301 | 14 (12 to 16) | 16 (14 to 18) | 1.2 (0.9 to 1.6) | -76 (184 to -32) |