Table 1.

Characterisation of the study group according to sex, age, medical and pharmacy costs

	Continuously employed
	No	%	%	Χ2 P value	Risk ratio	95% CI
Sex
Men	797	26.36	84.69	0.3884	1.00
Women	2226	73.64	83.38		0.98	0.95 to 1.02
Age groups
18–39	770	25.47	82.21	<0.0001	1.00
40–49	806	26.66	89.45		1.09	1.05 to 1.13
50–59	1088	35.99	88.24		1.07	1.03 to 1.12
60–76	359	11.88	60.45		0.74	0.67 to 0.80
Medical cost (US$)
0–184	755	25.0	87.55	<0.0001	1.00
185–604	757	25.0	85.07		0.97	0.93 to 1.01
605–2049	755	25.0	84.64		0.97	0.93 to 1.01
2050–7191	454	15.0	79.30		0.91	0.86 to 0.96
7192+	302	10.0	75.17		0.86	0.80 to 0.92
Pharmacy cost (US$)
0–6	759	25.0	86.92	<0.0001	1.00
7–194	755	25.0	85.21		0.99	0.69 to 1.03
195–903	755	25.0	82.59		0.96	0.92 to 1.00
904–2303	452	15.0	84.14		0.99	0.94 to 1.04
2304+	302	10.0	74.92		0.86	0.80 to 0.93

Sex, age, medical and pharmacy costs apply to the 2010–2011 academic year.