|  | Postoperative headache frequency (%) | ||
---|---|---|---|---|
Variable | Total (N = 420) | Yes(n = 228) | No(n = 192) | |
Gender | Male | 233 | 105(45.1) | 128(54.9) |
Female | 187 | 123(65.8) | 64(34.2) | |
Age(years) | < 30 years | 169 | 94(55.6) | 75(44.4) |
30–50 years | 152 | 80(52.6) | 72(47.4) | |
> 50 years | 99 | 54(54.5) | 45(45.5) | |
ASA status | ASA I | 254 | 139(54.7) | 115(45.3) |
ASA II&above | 166 | 89(53.6) | 77(46.4) | |
Npo-time | ≥ 16 h | 159 | 109(68.6) | 50(31.4) |
< 16 h | 261 | 119(45.6) | 142(54.4) | |
WBC | Low | 40 | 25(62.5) | 15(37.5) |
Normal | 22 | 190(53.1) | 168(46.9) | |
High | 358 | 13(59.1.5) | 9 (40.9) |