Table 3

Risk estimates of self-assessed sick leave because of low-back pain and register-based sick leaves of all causes

	Data source	Measures	Intervention		Control		Risk estimate (95% CI)
	Data source	Measures	n	Days	n	Days	Risk estimate (95% CI)
Per protocol	Self-report	Sick leave for more than 8 weeks due to low-back pain	105 (1.0%)		107 (11.1%)		11.78 (1.56 to 88.96)^*
Per protocol	Self-report	Cumulated sick-leave days due to low-back pain	34	406	41	1081	2.57 (1.52 to 4.37)^†
Per protocol	Register-based	Sick leave for more than 8 weeks, all causes	110 (10.9%)		114 (20.2%)		1.85 (0.97 to 3.53)^*
Per protocol	Register-based	Cumulated sick-leave days, all causes	31	1100	37	1595	1.24 (0.77 to 2.00)^†
Intention to treat	Register-based	Sick leave for more than 8 weeks, all causes	150 (11.3%)		150 (19.3%)		1.71 (0.98 to 2.97)^*
Intention to treat	Register-based	Cumulated sick-leave days, all causes	46	1665	47	2010	1.24 (0.83 to 1.87)^†