Table 4

Results of subgroup analysis of association between pre-diabetes and working hours by age and work characteristics

Characteristics	Case	Participants	OR (95% CI)			P for trend	P for interaction
Characteristics	Case	Participants	40 hours	41–52 hours	>52 hours	P for trend	P for interaction
Men (n=6324)
Occupational categories							0.146
White-collar	845	2774	1.00	1.04 (0.83 to 1.30)	1.06 (0.82 to 1.38)	0.664
Pink-collar	317	859	1.00	1.22 (0.72 to 2.06)	0.99 (0.60 to 1.65)	0.714
Green-collar	163	356	1.00	0.52 (0.16 to 1.65)	0.90 (0.32 to 2.55)	0.247
Blue-collar	936	2335	1.00	1.13 (0.84 to 1.53)	1.54 (1.15to 2.06)	0.001
Work schedule							0.864
Fixed	2060	5801	1.00	1.04 (0.87 to 1.25)	1.21 (1.01to 1.45)	0.031
Shift	201	523	1.00	1.64 (0.77 to 3.47)	1.64 (0.78 to 3.44)	0.317
Age (years)							0.309
30–39	497	1966	1.00	1.31 (0.94 to 1.83)	1.44 (1.01 to2.06)	0.047
40–49	687	2016	1.00	0.89 (0.67 to 1.19)	1.20 (0.89 to 1.61)	0.124
50–59	685	1569	1.00	1.05 (0.76 to 1.47)	1.11 (0.80 to 1.55)	0.529
≥60	392	773	1.00	1.29 (0.77 to 2.17)	1.12 (0.68 to 1.87)	0.079
Women (n=4001)
Occupational categories							0.442
White-collar	311	1527	1.00	1.14 (0.82 to 1.60)	0.78 (0.48 to 1.27)	0.619
Pink-collar	493	1263	1.00	0.62 (0.39 to 0.98)	0.77 (0.50 to 1.19)	0.706
Green-collar	169	309	1.00	1.42 (0.45 to 4.45)	0.94 (0.30 to 2.93)	0.309
Blue-collar	344	902	1.00	0.89 (0.58 to 1.35)	0.93 (0.59 to 1.45)	0.769
Work schedule							0.202
Fixed	1255	3826	1.00	0.85 (0.68 to 1.06)	0.87 (0.68 to 1.11)	0.302
Shift	62	175	1.00	2.71 (0.88 to 8.30)	2.57 (0.80 to 8.25)	0.121
Age (years)							0.978
30–39	143	994	1.00	0.79 (0.48 to 1.29)	0.79 (0.39 to 1.58)	0.451
40–49	313	1241	1.00	0.89 (0.62 to 1.31)	0.81 (0.54 to 1.23)	0.327
50–59	564	1220	1.00	0.95 (0.64 to 1.39)	1.02 (0.69 to 1.52)	0.828
≥60	297	546	1.00	0.94 (0.46 to 1.92)	0.82 (0.42 to 1.62)	0.485