Table III.

Associations between changes in return-to-work self-efficacy (RTWSE) using cut-off values and number of sick leave days for 12 months of follow-up.

		Number of sick leave daysa
		n	Crude mean	Crude mean differenceb	Adjusted mean differenceb,c	95% CI for adjusted mean difference
Total RTWSE score	Consistently low	37	169	0 (ref.)	0 (ref.)	0 (ref.)
	Reduced	9	158	–11	–7	–63 to 48
	Increased	19	133	–37	–35	–77 to 8
	Consistently high	43	82	–88	–84	–118 to –50
Meeting job demands	Consistently low	49	164	0 (ref.)	0 ref.	0 (ref.)
	Reduced	11	126	–38	–39	–88 to 10
	Increased	23	131	–32	–31	–72 to 10
	Consistently high	39	79	–85	–81	–113 to –49
Modifying job tasks	Consistently low	39	160	0 (ref.)	0 (ref.)	0 (ref.)
	Reduced	13	146	–14	–16	–67 to 34
	Increased	31	122	–38	–36	–75 to 3
	Consistently high	35	81	–79	–77	–112 to –41
Communicating needs to others	Consistently low	25	159	0 (ref.)	0 (ref.)	0 (ref.)
	Reduced	11	168	9	7	–50 to 63
	Increased	16	131	–28	–15	–67 to 38
	Consistently high	66	105	–54	–50	–88 to –12

RTWSE measured by the RTWSE-19. It was scored as a total score and as 3 subscales (meeting job demands, modifying job tasks and communicating needs to others). A cut-off of 5 was used to categorize scores at the start and end of rehabilitation as high or low. Based on this information a new varible was created categorizing self-efficacy as: (i) consistently low, (ii) reduced from high to low, (iii) increasing from low to high, or (iv) consistently high.

^aEstimated from linear regression analyses.

^bMean difference: difference in number of sick leave days relative to the reference group.

^cAdjusted for age, sex, education, rehabilitation programme and baseline score on the RTWSE questionnaire; CI: Confidence Interval.