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| Characteristics | Headache, n (%) | No headache, n (%) |
| Age groups (years) | ||
| <20 | 46 (33.3) | 48 (34.8) |
| 21-30 | 72 (56.2) | 72 (56.2) |
| 31-40 | 10 (7.2) | 7 (5.1) |
| 41-50 | 5 (3.6) | 5 (3.6) |
| >50 | 5 (3.6) | 6 (4.3) |
| Ethnic groups | ||
| Malay | 5 (3.6) | 4 (2.9) |
| Chinese | 91 (65.9) | 90 (65.2) |
| Indian | 31 (22.5) | 30 (21.7) |
| Others | 11 (8.0) | 14 (10.1) |
| Total | 138 | 138 |
