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Table 8 Adjusted models for predicting poor outcome (PGIC) at 14, 30 and 90 days follow up

From: Relationship between STarT Back Screening Tool and prognosis for low back pain patients receiving spinal manipulative therapy

Follow up point Variables in the equation OR (95% CI) Nagelkerke* sn/sp
14 days (n = 235) Pain for >30 days in year 3.2 (1.9 to 5.6) 0.26 90/25
Pain (for every 1 point increase) 0.8 (0.8 to 0.9)   
30 days (n = 131) Duration   0.32 92/29
   < 1 month 1.0   
   1–3 months 5.6 (1.8 to 17.0)   
   >3 months 2.4(1.1 to 5.5)   
90 days (n = 150)    0.45 94/23
Duration    
   < 1 month 1.0   
   1–3 months 9.3 (3.0 to 29.0)   
     >3 months 3.0(1.3 to 7.0)   
  1. * = variance explained by model; sn = sensitivity; sp = specificity; PGIC = Patient Global Impression of Change.