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Table 1 Baseline characteristics of the cohort separated according to signs of depression

From: Brief screening questions for depression in chiropractic patients with low back pain: identification of potentially useful questions and test of their predictive capacity

  Total cohort n = 925 No depression n = 843 Mild to severe depression n = 82 p-value*
Females 45% 43% 61% <0.01
Age, mean (sd) 43 (12) 44 (12) 40 (12) <0.01
Duration of LBP     <0.01
0-2 weeks 62% 65% 39%  
2-4 weeks 13% 13% 21%  
1-3 months 11% 11% 10%  
>3 months 14% 12% 30%  
>3 previous LBP episodes 49% 48% 57% 0.10
LBP intensity, median (IQR) 7 (5–8) 7 (5–8) 8 (6–8) <0.01
Leg pain >0 56% 54% 72% <0.01
RMDQ, mean (sd) 51 (24) 50 (24) 65 (20) <0.01
  1. *p-value for test of no difference between ‘no depression’ and ‘mild to severe depression’ the duration of LBP categories for non-depressed sum to 101% due to rounding of figures.