Variable |  | Total (N = 420) | Postoperative headache | |
---|---|---|---|---|
 |  |  | Yes(228) n- (%) | No(192) n -(%) |
Caffeine consumption | Yes No | 192 228 | 126(65.6) 102(44.7) | 66(34.4) 126(55.3) |
Cups of coffee | 1–3 cups | 113 | 70(61.9) | 43(38.1) |
3–6 cups | 68 | 48(70.6) | 20(20.4) | |
> 6 cups | 11 | 8(77.7) | 3(27.3) | |
Smoking history | Yes No | 9 411 | 3(33.3) 225(54.7) | 6(66.7) 186(45.3) |
Alcohol history | Yes No | 216 204 | 123(57.2%) 105(51.2) | 92(42.8) 100(48.8) |
Prior headache history | Yes No | 85 335 | 73(85.9) 155(46.3) | 12(14.1) 180(53.7) |
Family history of headache | Yes No | 79 341 | 55(69.6) 173(50.7) | 24(30.4) 168(49.3) |