Table 3.

Factors associated with holding board certification in internal medicine

		Odds ratio	95% Confidence interval			P value
Sex
	Male	1.00	Reference
	Female	0.87	0.79	–	0.97	0.01
Years since registration as physician
	0–9	1.00	Reference
	10–19	1.53	1.32	–	1.77	<0.001
	20–29	1.69	1.46	–	1.96	<0.001
	30–39	1.28	1.10	–	1.50	<0.001
	40–49	0.54	0.45	–	0.64	<0.001
	≥ 50	0.22	0.18	–	0.28	<0.001
Type of municipality
	City	1.00	Reference
	Town or village	0.93	0.80	–	1.08	0.31
Type of institution
	Academic hospital	1.00	Reference
	Other hospital	0.75	0.67	–	0.84	<0.001
	Clinics and others	0.65	0.57	–	0.74	<0.001
Main area of practice
	Internal medicine	1.00	Reference
	Subspecialty area	1.51	1.40	–	1.64	<0.001