Table 3. Multivariate, adjusted binary logistic regression for associations of headache with age, gender, smoking, drunkenness and other health complaints (whole sample).

	OR, 95% CI, p
Age	1.34, 1.23-1.46, p=0.000
Gender	2.45, 2.15-2.8, p=0.000
Smoking	1.94, 1.45-2.59, p=0.000
Drunkenness	1.18, 0.81-1.72, p=0.390
Stomachache	3.31, 2.66-4.13, p=0.000
Back pain	2.08, 1.71-2.54, p=0.000
Bad mood	2.06, 1.68-2.53, p=0.000
Irritability	1.39, 1.14-1.70, p=0.001
Nervousness	1.57, 1.32-1.87, p=0.000
Difficulty falling asleep	1.56, 1.27-1.90, p=0.000
Dizziness	4.82, 3.72-6.24, p=0.000

OR = odds ratio; 95% CI = 95% confidence interval; p = level of significance