Table 2.

Distribution of characteristics among participating patients.

		N	%
Gender
N = 27313	Female	18985	69.5
	Male	8328	30.5
Age (years)
N = 27379	18–24	1284	4.7
	25–29	2296	8.4
	30–34	3060	11.2
	35–39	2872	10.5
	40–44	2392	8.7
	45–49	1988	7.3
	50–54	2169	7.9
	55–59	2376	8.7
	60–64	2109	7.7
	65–69	1945	7.1
	70–74	1813	6.6
	75–79	1551	5.7
	80+	1524	5.6
Frequency of attendance (latest 12 months)
N = 25860	0–1	2434	9.4
	2–3	7848	30.4
	4–5	6535	25.3
	6–7	3534	13.7
	8–9	1840	7.1
	10+	3669	14.2
Self-rated health
N = 27087	Excellent	2350	8.7
	Very good	8121	30.0
	Good	10488	38.7
	Fair	5141	19.0
	Poor	987	3.6