eTable 2. Return to work.

		IG	CG				IG	CG
	n	%	%	HR	[95% CI]	p	AAP	AAP	ICC
Regular return to work	352	71.5	74.7	0.86	[0.61; 1.19]	0.355	0.697	0.739	0.04
Regular return to work or graded return to work	352	73.7	75.3	0.89	[0.66; 1.21]	0.459	0.736	0.767	0.00

We used mixed-effects models to calculate test statistics, controlled for gainful employment before the start of the rehabilitation program.

AAP, average adjusted predictions; CI, confidence interval; CG, control group; HR, hazard ratio; ICC, intracluster correlation coefficient; IG, intervention group