Table 1.

Differences between respondents and non-respondents, number (%), and mean ± SD (range)

	Respondents	Non-respondents	P-value
All, n	287	206
Men, n (%)	84 (29.3%)	61 (29.6%)	0.934
Women, n (%)	203 (70.7%)	145 (70.4%)
Age, years	51.5 ± 13.5	49.0 ± 13.4	0.048*
	(19–79)	(19–80)
Men, years	52.5 ± 14.5	46.7 ± 14.0	0.018*
	(19–79)	(19–73)
Women, years	51.0 ± 13.0	49.9 ± 13.0	0.463
	(22–79)	(22–80)

*p < 0.05.