Table 3.

Comparison of weighted one-year prevalences of primary headaches in Estonia [6] and in the online sample

PRIMARY HEADACHES	Weighted one-year prevalences (%) with 95% CIs in Estonian population aged 20–64	Weighted one-year prevalences (%) with 95% CIs in the online study sample
All headache	41.0 (38.2–43.8)	23.1 (22.0–24.3)
All migraine	17.7 (15.7–20.0)	7.6 (6.9–8.3)
● Episodic migraine	16.8 (14.8–19.1)	7.0 (6.4–7.8)
Definite	6.6 (5.3–8.2)	3.0 (2.6–3.5)
Probable	10.2 (8.6–12.1)	4.0 (3.5–4.6)
● Chronic migraine	0.9 (0.5–1.7)	0.5 (0.4–0.8)
Definite	0.7 (0.4–1.4)	0.2 (0.1–0.4)
Probable	0.2 (< 0.1–0.7)	0.3 (0.2–0.5)
All tension-type headache	18.0 (15.9–20.3)	13.2 (12.3–14.1)
● Episodic TTH	16.5 (14.4–18.7)	12.2 (11.4–13.2)
Definite	11.8 (10.1–13.8)	8.5 (7.8–9.3)
Probable	4.7 (3.6–6.0)	3.7 (3.2–4.3)
● Chronic TTH	1.5 (1.0–2.5)	0.9 (0.7–1.2)
Definite	1.5 (0.9–2.4)	0.6 (0.4–0.8)
Probable	0.1 (< 0.001–0.5)	0.3 (0.2–0.5)
Trigeminal autonomic cephalalgias	0.4 (0.1–1.0)	0.1 (0.0004–0.2)
Other primary headaches	2.5 (1.7–3.5)	1.1 (0.8–1.4)
Chronic daily headache (headache > 15 days a month)	2.7 (1.9–3.8)	1.4 (1.1–1.8)
Unidentifiable	2.0 (1.3–3.0)	0.8 (0.6–1.1)

TTH tension-type headache