Table 3.
Association of CD with headache-related visit stratified by gender, age, and year of study entry
| Stratum | Number of events | Headache incidence per 100,000 person-years | Adjusted* HR (95% CI) |
|---|---|---|---|
|
| |||
| Overall | 1,337 | 423 | 1.66 (1.56–1.77) |
|
| |||
| Gender | |||
| Male | 369 | 309 | 1.69 (1.50–1.90) |
| Female | 968 | 492 | 1.65 (1.54–1.77) |
|
| |||
| Age at Study Entry (years) | |||
| 0–19 | 574 | 398 | 1.54 (1.40–1.69) |
| 20–39 | 281 | 485 | 1.63 (1.42–1.86) |
| 40–59 | 319 | 442 | 1.90 (1.67–2.15) |
| 60–79 | 157 | 399 | 1.83 (1.53–2.20) |
| ≥80 | 6 | 210 | 0.93 (0.38–2.29) |
|
| |||
| Calendar Year of Study Entry | |||
| 1989 and before | 185 | 220 | 1.52 (1.29–1.80) |
| 1990–1999 | 631 | 402 | 1.61 (1.47–1.76) |
| 2000 and after | 521 | 692 | 1.80 (1.63–1.98) |
*
Compared to matched controls, adjusted for education level