Table 3.

Joint associations of long working hours and night work at baseline with incident diabetes

Exposures	New cases of diabetes at follow-up (n, %)	Model I	Model II	Model III	Model IV
Long working hours + Night work	—	—	—	—	—
No + No	6.23% (70/1123)	1.00	1.00	1.00	1.00
Yes + No	8.39% (13/155)	1.43 (0.82, 2.50)	1.51 (0.87, 2.63)	1.43 (0.83, 2.45)	1.43 (0.83, 2.45)
No + Yes	9.57% (11/115)	1.52 (0.83, 2.77)	1.64 (0.90, 2.98)	1.45 (0.80, 2.63)	1.45 (0.80, 2.63)
Yes + Yes	14.75% (9/61)	2.88 (1.52, 5.46)∗∗	3.36 (1.77, 6.38)∗∗∗	3.02 (1.64, 5.57)∗∗∗	3.02 (1.64, 5.58)∗∗∗
Synergy index	—	1.98 (0.45, 8.73)	2.05 (0.55, 7.61)	2.29 (0.53, 9.98)	2.30 (0.53, 9.98)

Poisson regression, ∗p < 0.05, ∗∗p < 0.01, ∗∗∗p < 0.001.

Model I: adjusted for age and sex at baseline.

Model II: Model I + additionally adjusted for race, marital status, education, and household income at baseline.

Model III: Model II + additionally adjusted for smoking, alcohol consumption, physical exercise, and body mass index at baseline.

Model IV: Model III + additionally adjusted for major depressive episode at baseline.