Table 3.

Association between shiftwork and total prostate-specific antigen (PSA) by category*

PSA value	OR	(95% CI)	P
<1.01	1.00	(referent)	—
1.01–2.00	1.03	(0.68 to 1.56)	.89
2.01–3.00	0.75	(0.35 to 1.64)	.47
3.01–4.00	1.39	(0.41 to 4.71)	.60
4.01–10.00	2.68	(1.01 to 7.12)	.05
>10.00	3.78	(0.87 to 16.37)	.08

* All statistical tests were two-sided. P values were calculated using logistic regression models.

Adjusted for age (continuous), body mass index (continuous), race (white, black, Hispanic, other), health insurance (yes/no), hours of sleep per night (continuous), and months on the current job (continuous). CI = confidence interval.