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Table 7 Utility of chiropractors’ prediction of patients not improving as categorised by PGIC* scores split by complaint

From: Prognostic accuracy of clinicians for back, neck and shoulder patients in routine practice

  Back Neck Shoulder
Week 4    
N 173 45 37
OR (95% CI) 1.1 (0.5 to 2.5) 4.0 (0.9 to 17.8) 1.3 (0.3 to 5.2)
Nagelkerke R2 0.00 0.10 0.00
+ve Likelihood ratio 0.0 2.8 0.0
−ve Likelihood ratio ** 0.7 **
AUC 0.5 (0.4 to 0.6) 0.6 (0.4 to 0.8) 0.5 (0.3 to 0.7)
Week 12    
N 124 35 23
OR (95% CI) 2.2 (0.8 to 6.1) 0.5 (0.05 to 4.9) 0.5 (0.04 to 5.5)
Nagelkerke R2 0.03 0.02 0.02
+ve Likelihood ratio 0.0 0.0 0.0
−ve Likelihood ratio ** ** **
AUC 0.6 (0.4 to 0.7) 0.5 (0.3 to 0.8) 0.6 (0.3 to 0.8)
  1. *(≤ 5 points), **unable to calculate as divided by 0, AUC=Area under curve.