Table 2.

Mean respondent age (range) by age group and gender

	male		female		total sample
	n	mean age (range*)	n	mean age (range*)	n	mean age
Age group 1	27	22.9 (19–26)	36	22.0 (17–28)	63	22.4
Age group 2	33	46.3 (39–50)	39	46.8 (41–53)	72	46.6
Age group 3	27	63.3 (60–72)	25	61.6 (55–65)	52	62.5

* ages of some respondents were outside the limits of the age groups approximately aimed at in the recruitment phase (see Methods)