Table 3

Generalised estimating equations predicting SRQ-20 scores

	SRQ-20 negative affect score			SRQ-20 somatic symptom scores			Total SRQ-20 score
	β	SE	95% Wald CI	β	SE	95% Wald CI	β	SE	95% Wald CI
			Lower, upper			Lower, upper			Lower, upper
Step 1: main variables
(Intercept)†	0.78	0.14	0.51 to 1.05*	1.68	0.17	1.36 to 2.01*	2.34	0.28	1.79 to 2.89*
Site 1, 2, 3 vs 4 (index)	0.71	0.16	0.40 to 1.01*	3.51	0.17	3.17 to 3.86*	4.27	0.30	3.68 to 4.87*
Outreach vs hospital (index)	0.33	0.13	0.07 to 0.58*	0.81	0.16	0.49 to 1.14*	1.22	0.27	0.68 to 1.76*
Change in visual acuity‡	0.98	0.11	0.76 to 1.20*	0.94	0.11	0.71 to 1.16*	2.12	2.10	1.71 to 2.53*
Change in paid work hours per day	−0.002	0.001	−0.003 to −0.00005*	−0.004	0.0009	−0.006 to −0.002*	−0.006	0.002	−0.009 to −0.003*
Step 2: including demographics
Female vs male (index)	0.40	0.16	0.10 to 0.71*	1.14	0.19	0.78 to 1.51*	1.64	0.33	0.10 to 2.27*
Postschool education vs no postschool education (index)	−0.52	0.25	−1.00 to −0.03*	−0.33	0.37	−1.07 to 0.40	−0.99	0.56	−2.08 to 0.11
Married vs not married (index)	−0.07	0.19	−0.44 to 0.31	−0.15	0.23	−0.61 to 0.31	−0.10	0.39	−0.87 to 0.67
Age	−0.002	0.01	−0.02 to 0.01	0.02	0.009	0.01 to 0.04*	0.02	0.02	−0.01 to 0.05
Change in unpaid work hours per day	−0.14	0.03	−0.19 to −0.09*	−0.21	0.04	−0.27 to −0.14*	−0.38	0.05	−0.49 to −0.28*
Step 3: interaction
Change in visual acuity×change in paid work (interaction)	0.01	0.03	−0.05 to 0.07	0.05	0.03	0.00 to 0.11	0.05	0.05	−0.05 to 0.15

*p<0.05.
†Negative coefficients indicate an increase in the respective variable alongside a decrease in the respective SRQ-20 score.
‡Lower values for visual acuity correspond to better visual acuity.
SRQ-20, Self-Reporting Questionnaire-20.