Table 1

Distribution of sociodemographic variables

		Non-patient				Patient		Total
		Class I–III	Class IV–V			Class I–III	Class IV–V	Total
Male
20–39	53	50		51	55	209
40–64	51	52		50	50	203
⩾65	53	49		49	51	202
Female
20–39	54	56		53	55	218
40–64	52	49		57	60	218
⩾65	49	50		54	55	208
Total	312	306		314	326	1258