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Table 1 Summary test characteristics of each of the 3 measures analysed

From: Using a decline in serum hCG between days 0–4 to predict ectopic pregnancy treatment success after single-dose methotrexate: a retrospective cohort study

TEST 1: Falling hCG between days 0-4
  Treatment Success Treatment Failure Total  
Falling hCG 94 16 110 PPV: 85% (95% CI 79-92%)
Rising hCG 52 44 96 NPV: 46%
Total 146 60 206  
  Sensitivity: Specificity:   
  64% 73%    
TEST 2: ≥15% Fall in hCG between days 4-7
  Treatment Success Treatment Failure Total  
Falling hCG 121 15 136 PPV: 89% (95% CI 84-94%)
Rising hCG 25 45 70 NPV: 64%
Total 146 60 206  
  Sensitivity: Specificity:   
  83% 75%    
TEST 3: <20% Fall in hCG between days 0-4
  Treatment Success Treatment Failure Total  
Falling hCG 59 4 63 PPV: 94% (95% CI 88-100%)
Rising hCG 87 56 143 NPV: 39%
Total 146 60 206  
  Sensitivity: Specificity:   
  40% 93%