Table 3.
Association between work hours and incident cardiovascular disease in part-time (averaging <35 work hours per week) and full-time (averaging ≥35 work hours per week) workers: Panel Study of Income Dynamics, 1986–2011.
| Variable | Part-Time Workers (n = 592)
|
Full-Time Workers (n = 1,334)
|
||||||
|---|---|---|---|---|---|---|---|---|
| Univariate modela
|
Multivariate modela,b
|
Univariate modela
|
Multivariate modela,b
|
|||||
| RR | (95% C.I.) | RR | (95% C.I.) | RR | (95% C.I.) | RR | (95% C.I.) | |
| Work Hours per Week^ | 0.98 | (0.96 – 1.00) | 0.99 | (0.96 – 1.02) | 1.01 | (1.00 – 1.02) | 1.01 | (1.00 – 1.02)* |
| Age | 1.02 | (1.01 – 1.03) | 1.04 | (1.02 – 1.05) | 1.04 | (1.03 – 1.04) | 1.04 | (1.03 – 1.05) |
| Sex | ||||||||
| Female | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent |
| Male | 1.29 | (0.93 – 1.80) | 0.89 | (0.60 – 1.31) | 1.06 | (0.89 – 1.27) | 1.04 | (0.84 – 1.29) |
| Race/Ethnicity | ||||||||
| White, Non-Hispanic | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent |
| Black, Non-Hispanic | 1.87 | (1.38 – 2.53) | 2.01 | (1.27 – 3.17) | 1.45 | (1.18 – 1.78) | 1.67 | (1.29 – 2.15) |
| Hispanic | 1.27 | (0.64 – 2.52) | 1.22 | (0.62 – 2.43) | 1.44 | (0.91 – 2.27) | 1.58 | (1.07 – 2.33) |
| Other | 1.59 | (0.78 – 3.27) | 1.75 | (0.95 – 3.23) | 1.47 | (0.92 – 2.34) | 1.39 | (0.85 – 2.25) |
| Pay Status | ||||||||
| Salaried | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent |
| Hourly | 1.26 | (0.90 – 1.75) | 1.21 | (0.85 – 1.71) | 1.07 | (0.91 – 1.27) | 1.15 | (0.96 – 1.39) |
a
All calculations take into account clustering and probability weighting.
b
All calculations take into account clustering and probability weighting.
*
P value < 0.05
^
Continuous measure of average work hours per week over the study duration