Table 3.

Contribution of the Demand-Control-Support and the Effort-Reward Imbalance models to income inequalities in psychological distress among men

	Model I	Model II	Model III	Model IV	Model V	Model VI
	Age-adjusted	Model I + Psychological demand	Model I + Job control	Model I + Social support	Model I + Reward	Model I + Job control, reward and social support
Contributiona % (95% CI)	REF	−24 (−40;−6)	9 (−3; 20)	14 (−3; 24)	24 (9; 38)	23 (5; 40)
Mean differences (95% CI)
Household income ($/year)
≥100 000	REF	REF	REF	REF	REF	REF
60 000–99 999	0.32 (−0.10; 0.74)	0.61 (0.21; 1.01)**	0.28 (−0.13; 0.70)	0.25 (−0.16; 0.67)	0.19 (−0.22; 0.61)	0.22 (−0.20; 0.63)
40 000–59 999	0.62 (0.16; 1.07)**	0.93 (0.49; 1.37)**	0.56 (0.10; 1.03)*	0.55 (0.10; 1.01)*	0.32 (−0.13; 0.78)	0.39 (−0.07; 0.85)
0–39 999	1.26 (0.79; 1.73)***	1.56 (1.11; 2.02)***	1.15 (0.66; 1.63)***	1.09 (0.62; 1.55)***	0.95 (0.48; 1.42)***	0.96 (0.48; 1.45)***
Psychological demand (tertiles)
0–7.2		REF
7.3–10		0.92 (0.59; 1.26)***
>10		2.44 (2.05; 2.83)***
Job control (tertiles)
≥25			REF			REF
21–24.9			−0.04 (−0.41; 0.32)			−0.20 (−0.57; 0.18)
0–20.9			0.46 (0.06; 0.85)*			0.00 (−0.42; 0.42)
Social support at work
≥56				REF		REF
48–55				−0.01 (−0.38; 0.36)		−0.21 (−0.61; 0.19)
0–47				1.28 (0.89; 1.68)***		0.65 (0.19; 1.11)**
Working alone				0.35 (−0.48; 1.18)		−0.15 (−1.10; 0.79)
Reward (tertiles)
>16					REF	REF
14–16					0.30 (−0.07; 0.66)	0.19 (−0.20; 0.58)
0–13					1.71 (0.34; 2.08)***	1.37 (0.94; 1.80)***

*p-value <0.05, **p-value <0.01, ***p-value <0.001

^aContribution calculated with this formula, (MD_basic – MD_adjusted)/(MD_basic), where MD_basic = Mean differences for age-adjusted models and MD_adjusted = Mean differences for models adjusted for work variables at each steps for the 0–39 999$ per year category of household income. Jackknife method was used to calculate 95% IC of the contributions