Table 2 Results from the Cox regression analyses regarding first return to regular work.

	Median number of days (IQR)	Hazard ratios for return to regular work (95% confidence interval)*
				Prior workplace intervention
				Yes	No
Intention‐to‐treat analysis (n = 112)
Graded activity (n = 55)	139.0 (69.0)	0.52 (0.32–0.86)	0.66 (0.40–1.10)†	0.39 (0.19–0.81)	0.86 (0.40–1.84)
Usual care (n = 57)	111.0 (76.0)
Per protocol analysis (n = 88)
Graded activity (n = 36)	143.5 (61.3)	0.57 (0.33–0.98)	0.68 (0.38–1.20)†	0.32 (0.14–0.71)	1.02 (0.44–2.38)
Usual care (n = 53)	114.0 (77.5)

*Adjusted for effect of workplace intervention, time of randomisation, and gender.

†Also adjusted for delay in referral.