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Table 2 Demographic and clinical characteristics of respondents at baseline

From: Primum non nocere: shared informed decision making in low back pain – a pilot cluster randomised trial

  Decision support package Usual care
n (%) n (%)
No. of participants 85 (57.4) 63 (42.6)
Age, years     
 Mean (SD) 46.9 (13.8) 48.8 (16.7)
 Median (IQR) 47.6 (36.1, 56.9) 46.8 (33.5, 63.4)
Sex:     
 Male 28 (32.9) 22 (34.9)
 Female 57 (67.1) 41 (65.1)
Ethnicity:     
 White 71 (83.5) 56 (88.9)
 Mixed 3 (3.5) 2 (3.2)
 Asian or Asian British 7 (8.2) 3 (4.8)
 Black or Black British 3 (3.5) 2 (3.2)
 Chinese 1 (1.2) 0 (0.0)
Currently working:     
 Yes 45 (52.9) 35 (55.6)
 No: 40 (47.1) 28 (44.4)
  Retired 13 (31.7) 14 (46.7)
  Stay at home 4 (9.8) 3 (10.0)
  Unable to work due to low back pain 8 (19.5) 8 (26.7)
  Unable to work due to other illness 6 (14.6) 2 (6.7)
  Unemployed and looking for work 3 (7.3) 1 (3.3)
  In full time education 2 (4.9) 0 (0.0)
  Others 5 (12.2) 2 (6.7)
Hours of paid work per week:     
 No. of participants 49   38  
 Mean (SD) 31.8 (12.6) 30.2 (12.4)
 Median (IQR) 37 (25, 40) 35 (21, 39)
Pain in lower back pain in the last four weeks:
 Yes 85 (100.0) 63 (100.0)
If Yes:     
 Pain limit usual activities for more than one day:
  Yes 70 (84.3) 54 (85.7)
  No 13 (15.7) 9 (14.3)
 Frequency of lower back pain:     
  On some days 4 (4.7) 4 (6.4)
  On most days 13 (15.3) 12 (19.1)
  Everyday 68 (80.0) 47 (74.6)
 The length of time since free of low back pain for one whole month:
  < 3 months ago 23 (27.4) 21 (33.3)
  ≥ 3 months ago but < 7 months ago 18 (21.4) 5 (7.9)
  ≥ 7 months ago but < 3 years ago 26 (31.0) 24 (38.1)
  ≥ 3 years ago 17 (20.2) 13 (20.6)
Pain down the leg:     
 Yes 62 (72.9) 46 (73.0)
 No 23 (27.1) 17 (27.0)
If Yes:     
 Pain spread below the knee:     
  Yes 38 (62.3) 27 (58.7)
  No 23 (37.7) 19 (41.3)
Roland Morris disability questionnaire (0–24, 0 = best)
 No. of participants 85   63  
 Mean (SD) 10.66 5.9 10.6 5.3
 Median (IQR) 11.0 (6.0, 14.0) 11.0 (6.0, 14.0)
Modified Von Korff disability score (0–100, 0 = best)
 No. of participants 84   62  
 Mean (SD) 61.3 23.9 56.8 26.0
 Median (IQR) 65.0 (48.3, 80.0) 58.3 (40.0, 76.7)
Modified Von Korff pain score (0–100, 0 = best)
 No. of participants 84   63  
 Mean (SD) 68.5 20.3 67.1 17.2
 Median (IQR) 73.3 (53.3, 83.3) 70.0 (56.7, 80.0)
Norm-based physical component score of SF-12 (0–100, 100 = best)
 No. of participants 85   55  
 Mean (SD) 34.6 9.5 35.1 9.0
 Median (IQR) 33.5 (27.2, 42.8) 34.3 (29.0, 40.0)
Norm-based mental component score of SF-12 (0–100, 100 = best)
 No. of participants 85   55  
 Mean (SD) 42.6 12.8 44.4 12.2
 Median (IQR) 42.7 (34.8, 53.6) 44.9 (37.2, 54.2)
Hospital anxiety and depression scale: anxiety (0–21, 0 = best)
 No. of participants 83   60  
 Mean (SD) 7.6 4.4 7.5 4.2
 Median (IQR) 7.0 (4.0, 11.0) 7 (4.5, 11.5)
Hospital anxiety and depression scale: depression (0–21, 0 = best)
 No. of participants 82   59  
 Mean (SD) 7.2 4.7 7.2 5.0
 Median (IQR) 6.5 (4.0, 10.0) 7 (3.0, 11.0)
Pain self-efficacy questionnaire (0–60, 60 = best)
 No. of participants 82   61  
 Mean (SD) 34.2 15.6 31.5 14.8
 Median (IQR) 37.0 (24.0, 44.0) 32.0 (19.0, 45.0)
Fear avoidance beliefs questionnaire (0–24, 0 = best)
 No. of participants 85   59  
 Mean (SD) 14.3 5.9 15.5 5.5
 Median (IQR) 15 (10.0, 18.0) 17 (12.0, 19.0)
  1. Abbreviations: SD standard deviation; IQR interquartile range.