Table 3.

Associations between selected variables and operative restoration of upper 1st molars. Results are presented as odds ratios (OR) with 95% confidence interval (CI). Results significant at 5% level are marked in bold. ref: reference category.

Selected variables	Unadjusted			Adjusted
	OR	95% CI	P value	OR	95% CI	P value
Age
43–72 years (ref)
25–42 years	1.1	0.8–1.5	0.71	1.2	0.9–1.7	0.31
Gender
Male (ref)
Female	1.4	1.0–2.0	0.03	1.5	1.1–2.1	0.02
Practice location
East (ref)
West	1.1	0.8–1.6	0.53	1.1	0.8–1.6	0.55
North	0.8	0.5–1.2	0.29	0.8	0.5–1.3	0.36
Refer cases
No (ref)
Yes	1.2	0.7–2.0	0.56	1.2	0.7–2.1	0.5