Table 3 Prevalence OR of headache related to use of caffeine
Variables | Total | Headache <7 days/week | Headache 7–14 days/week | Headache >14 days/week | |||
|---|---|---|---|---|---|---|---|
51,383 | % | OR (CI) | % | OR (CI) | % | OR (CI) | |
Use of caffeine | |||||||
0–240 mg | 12,190 | 31.6 | 1.00 (reference) | 5.5 | 1.00 (reference) | 2.7 | 1.00 (reference) |
241–400 mg | 15,211 | 29.2 | 0.99 (0.94–1.05) | 4.9 | 0.96 (0.86–1.08) | 1.9 | 0.63 (0.53–0.74) |
401–540 mg | 10,935 | 30.4 | 1.02 (0.96–1.08) | 4.9 | 0.92 (0.81–1.04) | 2.0 | 0.63 (0.52–0.75) |
>540 mg | 12,147 | 33.8 | 1.16 (1.09–1.23) | 6.0 | 1.12 (0.99–1.26) | 2.6 | 0.82 (0.69–0.98) |
Missing | 900 | 21.1 | 0.85 (0.71–1.02) | 5.4 | 1.21 (0.88–1.66) | 2.9 | 0.85 (0.56–1.30) |
P trend value | P < 0.001 | P = 0.13 | P = 0.09 | ||||