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Table 3 The mean time to event and Hazard Ratio of a new low back pain episode, mean length of consecutive pain-free periods and total number of pain-free weeks

From: The Nordic maintenance care program: maintenance care reduces the number of days with pain in acute episodes and increases the length of pain free periods for dysfunctional patients with recurrent and persistent low back pain - a secondary analysis of a pragmatic randomized controlled trial

Variable (95% CI)

 

All participants (n = 250)

AC (n = 80)

ID (n = 50)

DYS (n = 73)

 

Hazard ratio (MC/Control), HR

 

1.1 (0.9, 1.5)

1.3 (0.8, 2.1)

1.5 (0.8, 2.7)

0.8 (0.5, 1.2)

 

Time to event, number of weeks to first relapse (single event), mean

MC

15.0 (12.6, 17.4)

16.7 (12.0, 21.5)

11.5 (7.9, 15.1)

13.8 (10.3, 17.2)

 

Control

16.3 (13.4, 19.2)

20.2 (14.4, 26.0

15.8 (10.3, 21.4)

11.4 (7.3, 15.5)

 

Difference

−1.3 (−5.2, 2.5)

−3.4 (− 11.1, 4.3)

−4.3 (− 11.0, 2.4)

2.4 (− 3.1, 7.9)

 

Total number of pain-free weeks during entire study period (between all events), mean.

MC

33.5 (30.1, 36.9)

32.9 (28.4, 37.4)

30.3 (17.9, 42.6)

37.3 (33.0, 41.6)

 

Control

30.9 (28.0, 33.7)

34.8 (29.5, 40.1)

29.2 (23.0, 35.4)

27.4 (22.4, 32.4)

 

Difference

2.6 (−1.8, 7.0)

−1.9 (−8.7, 4.9)

1.0 (− 13.2, 15.3)

9.8 (3.3, 16.3)

 

Length of pain-free periods (weeks between all events), mean

MC

16.4 (14.1, 18.7)

18.3 (13.6, 22.9)

12.4 (8.0, 17.0)

16.1 (12.7, 19.6)

 

Control

17.2 (14.5, 20.0)

21.4 (15.9, 26.9)

15.6 (9.9, 21.3)

12.3 (8.6, 16.1)

 

Difference

−0.8 (−4.4, 2.8)

−3.1 (−10.2, 4.0)

3.1 (− 10.1, 3.9)

3.8 (− 1.2, 8.8)

 
  1. AC Adaptive Copers; ID Interpersonally Distressed; DYS Dysfunctional; CI Confidence interval; HR Hazard Ratio; MC Maintenance Care; An event (new pain episode) was defined as a week with ≥2 [2,3,4,5,6,7] days with bothersome LBP preceded by ≥4 consecutive pain-free weeks