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Table 2 Demographic details

From: Identification of subgroup effect with an individual participant data meta-analysis of randomised controlled trials of three different types of therapist-delivered care in low back pain

Characteristics Controlc
(No. of trials
m = 14; No. of participants
n = 3573)
Interventiond
(No. of trials m = 19; No. of participants
n = 5755)
All
(No. of trials
m = 19; No. of participants n = 9328)
Demographics
Age, years
  No. of trials, m: no. of participants, n 14 3573 19 5753 19 9326
  Mean (SD) 50.13 (13.77) 48.18 (13.9) 48.92 (13.88)
Sex
  No. of trials, m 14   19   19  
  Female (%) 2053 (57.47) 3296 (57.28) 5349 (57.36)
  Male (%) 1519 (42.53) 2458 (42.72) 3977 (42.64)
Ethnicity
  No. of trials, m 4   5   5  
  White (%) 478 (89.35) 891 (88.66) 1369 (88.9)
  Mixed (%) 3 (0.56) 4 (0.40) 7 (0.45)
  Black (%) 21 (3.93) 26 (2.59) 47 (3.05)
  Asian (Indian, Pakistani, Bangladeshi, others) (%) 17 (3.18) 44 (4.38) 61 (3.96)
  Chinese (%) 1 (0.19) 2 (0.20) 3 (0.19)
  Others (%) 15 (2.80) 38 (3.78) 53 (3.44)
Smoking status
  No. of trials, m 2   6   6  
  No (%) 123 (74.10) 763 (64.39) 886 (65.58)
  Yes (%) 43 (25.90) 422 (35.61) 465 (34.42)
Employment status
  No. of trials, m 7   11   11  
  Full time employment (%) 489 (53.80) 1256 (49.68) 1745 (50.77)
  Part time employment (%) 190 (20.90) 442 (17.48) 632 (18.39)
  No employment (%) 230 (25.30) 830 (32.83) 1060 (30.84)
BMI
  No. of trials, m: no. of participants, n 2 915 5 1189 5 2104
  Mean (SD) 26.44 (4.60) 1189 (26.67) 26.57 (4.73)
  1. am, number of trials
  2. bn, number of participants
  3. cControl arm includes best usual care and sham treatments. Four trials did not have control arm
  4. dIntervention arm includes active physical, passive physical, psychological and combination