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Table 3 Predictive values

From: Nurses' prediction of volume status after aneurysmal subarachnoid haemorrhage: a prospective cohort study

Predicted and measured CBV values Value (95% CI)
Predicted hypovolaemia and measured hypovolaemia (CBV <60 ml/kg)
   Prior probability 0.44 (0.39 to 0.49)
   Sensitivity 0.10 (0.06 to 0.16)
   Specificity 0.87 (0.81 to 0.91)
   Positive predictive value 0.37 (0.23 to 0.53)
   Negative predictive value 0.55 (0.49 to 0.61)
Predicted hypovolaemia and measured severe hypovolaemia (CBV <50 ml/kg)
   Prior probability 0.18 (0.14 to 0.23)
   Sensitivity 0.10 (0.04 to 0.20)
   Specificity 0.88 (0.83 to 0.91)
   Positive predictive value 0.15 (0.06 to 0.30)
   Negative predictive value 0.82 (0.77 to 0.86)
Predicted hypervolaemia and measured hypervolaemia (CBV >80 ml/kg)
   Prior probability 0.15 (0.12 to 0.20)
   Sensitivity 0.06 (0.01 to 0.16)
   Specificity 0.85 (0.80 to 0.89)
   Positive predictive value 0.06 (0.02 to 0.19)
   Negative predictive value 0.83 (0.78 to 0.87)
  1. CBV, circulating blood volume.