Table 2. Adjusted odds ratios (OR) of NIH-IV Prostatitis by selected factors.

Variable	ALL	Unadjusted OR		Multivariate-adjusted OR ▽
	(n = 1868)	OR (95% CI)	P-value	OR (95% CI)	P-value
Age (yrs)
<40	898	1		1
≧40	970	1.35 (1.08, 1.69)	0.008	1.35 (1.06, 1.71)	0.01
Cigarette smoking
Never smokers	965	1		1
Smokers<15 Pack-years	436	1.05 (0.79, 1.39)	0.67	1.07 (0.80, 1.44)	0.62
Smokers≧15 Pack-years	467	1.49 (1.14, 1.93)	0.003	1.33 (1.01, 1.75)	0.03
Alcohol drinking
Never drinkers	534	1		1
drinkers<1 drinks/week	395	0.95 (0.68, 1.33)	0.79	1.01 (0.72, 1.42)	0.94
drinkers≧1 drinks/week	939	1.32 (1.01, 1.71)	0.03	1.35 (1.03, 1.77)	0.02
Education of college or above
Yes	1054	1		1
No	814	1.22 (0.97, 1.52)	0.08	1.19 (0.94, 1.50)	0.14
Physical activity
Yes	916	1		1
No	952	1.04 (0.83, 1.30)	0.71	0.99 (0.79, 1.25)	0.97
Obesity
No	1652	1		1
Yes	216	0.92 (0.64, 1.31)	0.65	1.11 (0.77, 1.61)	0.55
Hypertension
No	1452	1		1
Yes	416	1.06 (0.81, 1.38)	0.65	0.98 (0.74, 1.30)	0.89
Dyslipidemia
No	809	1		1
Yes	1059	0.96 (0.77, 1.20)	0.76	0.91 (0.72, 1.76)	0.47
Diabetes
No	1787	1		1
Yes	81	1.15 (0.68, 1.95)	0.59	1.02 (0.59, 1.76)	0.91

^▽Adjusted for other variables in the table.