Table 2.

Association between work hours and incident cardiovascular disease: Panel Study of Income Dynamics, 1986–2011.

Variable	Univariate modela		Multivariate modela,b
	RR	(95% C.I.)	RR	(95% C.I.)
Work Hours per Week^	1.00	(1.00 – 1.01)	1.01	(1.00 – 1.02)*
Age	1.03	(1.02 – 1.04)	1.03	(1.03 – 1.04)
Sex
Female	1.00	Referent	1.00	Referent
Male	1.11	(0.97 – 1.27)	1.07	(0.91 – 1.25)
Race/Ethnicity
White, Non-Hispanic	1.00	Referent	1.00	Referent
Black, Non-Hispanic	1.56	(1.32 – 1.84)	1.64	(1.37 – 1.97)
Hispanic	1.37	(0.93 – 2.02)	1.35	(0.97 – 1.88)
Other	1.50	(1.00 – 2.25)	1.28	(0.87 – 1.89)
Pay Status
Salaried	1.00	Referent	1.00	Referent
Hourly	1.10	(0.95 – 1.28)	1.17	(1.02 – 1.35)

^aAll calculations take into account clustering and probability weighting.

^bAll calculations take into account clustering and probability weighting.

^*P value < 0.05

^{^}Continuous measure of average work hours per week over the study duration