. 2023 Feb 14;16:421–436. doi: 10.2147/JPR.S390747

Table 4.

Association Between Change in Self-Rated Work Ability from Inclusion to End of IPRP and Participation in Work Interventions

Intervention and Interaction Variables	n	B	t	p	95% CI for B		Partial eta²	R²
Ergonomic + self-rated work ability initial	1849							0.20
Constant		2.15	21.51	<0.001	1.95	2.34
Self-rated work ability initial		−0.40	−23.78	<0.001	−0.44	−0.37
Ergonomic intervention		0.36	3.73	<0.001	0.17	0.55
Ergonomic + self-rated work ability initial +
Sex + employment + interactions								0.20
Constant		1.70	7.16	<0.001	1.23	2.16
Self-rated work ability initial		−0.42	−24.20	<0.001	−0.45	−0.38	0.20
Ergonomic intervention		0.40	1.46	0.14	−0.14	0.93	0.003
Sex		−0.02	−0.09	0.93	−0.48	0.44	<0.001
Interaction sex × ergonomic intervention		0.08	0.30	0.76	−0.43	0.59	<0.001
Employment		0.56	2.26	0.02	0.08	1.05	0.006
Interaction employment × ergonomic intervention		−0.05	−0.17	0.87	−0.61	0.51	<0.001
RTW plan + self-rated work ability initial	2250							0.20
Constant		1.85	13.13	<0.001	1.57	2.12
Self-rated work ability initial		−0.41	−24.14	<0.001	−0.44	−0.37
RTW plan		0.67	4.83	<0.001	0.40	0.94
RTW plan + self-rated work ability initial +
Sex + employment + interactions								0.21
Constant		0.49	1.36	0.17	−0.21	1.19
Self-rated work ability initial		−0.42	−24.51	<0.001	−0.45	−0.38	0.20
RTW plan		1.74	4.61	<0.001	1.00	2.48	0.006
Sex		0.42	1.10	0.27	−0.32	1.15	0.001
Interaction sex × RTW plan		−0.40	−1.02	0.31	−1.17	0.37	<0.001
Employment		1.54	4.03	<0.001	0.79	2.29	0.009
Interaction employment × RTW plan		−1.17	−2.91	<0.001	−1.96	−0.38	0.004
Stakeholder meeting + self-rated work ability initial	1064							0.20
Constant		2.62	32.62	<0.001	2.46	2.78
Self-rated work ability initial		−0.41	−25.39	<0.001	−0.45	−0.38
Stakeholder meeting		−0.44	4.62	<0.001	−0.61	−0.28
Stakeholder meeting + self-rated work ability initial +
Sex + employment + interactions								0.21
Constant		2.05	13.63	<0.001	1.75	2.34
Self-rated work ability initial		−0.43	−25.91	<0.001	−0.46	−0.39	0.21
Stakeholder meeting		−0.03	−0.11	0.92	−0.48	0.43	0.003
Sex		0.20	1.61	0.11	−0.04	0.45	<0.001
Interaction sex × stakeholder meeting		−0.30	−1.46	0.14	−0.71	0.10	0.001
Employment		0.67	4.32	<0.001	0.36	0.97	0.005
Interaction employment × stakeholder meeting		−0.42	−1.71	0.09	−0.90	0.06	0.001
Workplace visit + self-rated work ability initial	116							0.18
Constant		2.28	32.80	<0.001	2.15	2.42
Self-rated work ability initial		−0.39	−23.78	<0.001	−0.42	−0.35
Workplace visit		0.18	0.89	0.38	−0.21	0.56
Workplace visit + self-rated work ability initial +
Sex + interaction								0.18
Constant		2.27	31.03	<0.001	2.13	2.41
Self-rated work ability initial		−0.39	−23.77	<0.001	−0.42	−0.35	0.18
Workplace visit		0.11	0.51	0.61	−0.32	0.54	0.001
Sex		0.07	0.64	0.52	−0.14	0.27	<0.001
Interaction sex × workplace visit		0.36	0.71	0.48	−0.64	1.36	<0.001

Notes: Results from analysis of each intervention shown separately and adjusted for self-rated work ability initial, sex, and employment. Bold values indicate significant association at p < 0.001. R², proportion of variation explained by the model.

Abbreviations: n, number; B, regression coefficient; t, t-value; p, p-value; CI, confidence interval.