Table 2 Prevalence OR of headache related to use of caffeine
Variables | Total | Headache | Migraine | Non-migrainous headache | |||
|---|---|---|---|---|---|---|---|
51,383 | % | OR (CI) | % | OR (CI) | % | OR (CI) | |
Use of caffeine | |||||||
0–240 | 12,190 | 39.8 | 1.00 (reference) | 12.7 | 1.00 (reference) | 27.1 | 1.00 (reference) |
241–400 mg | 15,211 | 36.1 | 0.96 (0.91–1.00) | 11.7 | 1.02 (0.94–1.10) | 24.4 | 0.94 (0.88–0.99) |
401–540 mg | 10,935 | 37.3 | 0.97 (0.92–1.03) | 11.7 | 1.00 (0.92–1.10) | 25.6 | 0.96 (0.90–1.03) |
>540 mg | 12,147 | 42.2 | 1.13 (1.07–1.20) | 12.6 | 1.10 (1.01–1.20) | 29.9 | 1.14 (1.07–1.21) |
Missing | 900 | 29.4 | 0.90 (0.77–1.06) | 8.7 | 0.95 (0.73–1.23) | 20.8 | 0.90 (0.75–1.08) |
P trend value | P < 0.001 | P = 0.02 | P < 0.001 | ||||