Table 3.

Bivariate logistic regression analyses of headache type versus demographic variables (N = 2505)

Variable	Migraine	TTH	pMOH	Other headache on ≥ 15 d/m	UdH
	Odds ratio [95% CI]
Gender
male (n = 1169)	reference	reference	reference	reference	reference
female (n = 1336)	1.2 [1.0–1.5]	1.2 [1.01–1.5]1	7.1 [1.6–30.8]2	3.0 [1.7–5.1]4	1.0 [0.8–1.2]
Age group (years)
7–11 (n = 1382)	reference	reference	reference	reference	reference
12–17 (n = 1123)	1.5 [1.2–1.8]4	2.2 [1.9–2.7]4	4.3 [1.4–13.2]2	3.9 [2.3–6.7]4	1.0 [0.85–1.2]
School income category*
high (n = 1828)	reference	reference	reference	reference	reference
middle or low (n = 677)	0.8 [0.6–0.98]1	0.7 [0.6–0.9]2	1.0 [0.4–2.9]	0.8 [0.5–1.4]	1.3 [1.1–1.6]2
School locality
urban (n = 1660)	reference	reference	reference	reference	reference
semi-rural (n = 336)	1.0 [0.8–1.4]	1.0 [0.8–1.3]	1.4 [0.4–4.9]	1.9 [1.1–3.5]1	1.2 [0.9–1.5]
rural (n = 509)	0.7 [0.6–0.96]1	0.8 [0.7–1.05]	1.2 [0.4–3.7]	1.2 [0.6–2.1]	1.5 [1.2–1.9]3

TTH tension-type headache, pMOH probable medication-overuse headache, d/m days/month, UdH undifferentiated headache, CI confidence interval; * see text or Table 1 for explanation; significant values are emboldened: ¹p < 0.05; ²p < 0.01; ³p < 0.001; ⁴p ≤ 0.0001