Results


Diagnostic or Screening Test Evaluation


Single Table Analysis
PositiveNegativeTotal
Level 133336
8.3%91.7%100%
5.9%56.9% 
Level 2268
25%75%100%
3.9%10.3% 
Level 3268
25%75%100%
3.9%10.3% 
Level 4111122
50%50%100%
21.6%19% 
Level 533235
94.3%5.7%100%
64.7%3.4% 
5158109
46.8%53.2%100%
100%100%

Cut-off point between level 1 and 2

ParameterEstimate95% CI

Sensitivity0.9411(0.8766 - 1.0057)
Specificity0.5689(0.4415 - 0.6964)
Positive Predictive Value0.6575(0.5486 - 0.7664)
Negative Predictive Value0.9166(0.8263 - 1.0069)
Diagnostic Accuracy0.7431(0.6611 - 0.8251)
Likelihood ratio of a Positive Test2.1835(2.0137 - 2.3676)
Likelihood ratio of a Negative Test0.1033(0.0514 - 0.2078)
Diagnostic Odds21.1200(5.8899 - 75.7309)
Cohen's kappa (Unweighted)0.4972(0.3247 - 0.6696)
Entropy reduction after a Positive Test0.0484
Entropy reduction after a Negative Test0.4042
Bias Index0.2018
 

Cut-off point between level 2 and 3

 
ParameterEstimate95% CI

Sensitivity0.9019(0.8203 - 0.9835)
Specificity0.6724(0.5516 - 0.7932)
Positive Predictive Value0.7077(0.5971 - 0.8182)
Negative Predictive Value0.8863(0.7925 - 0.9801)
Diagnostic Accuracy0.7798(0.7020 - 0.8576)
Likelihood ratio of a Positive Test2.7533(2.4720 - 3.0667)
Likelihood ratio of a Negative Test0.1458(0.0961 - 0.2211)
Diagnostic Odds18.8842(6.4544 - 55.2508)
Cohen's kappa (Unweighted)0.5650(0.3834 - 0.7466)
Entropy reduction after a Positive Test0.0868
Entropy reduction after a Negative Test0.3370
Bias Index0.1284
 

Cut-off point between level 3 and 4

 
ParameterEstimate95% CI

Sensitivity0.8627(0.7683 - 0.9571)
Specificity0.7758(0.6685 - 0.8831)
Positive Predictive Value0.7719(0.6630 - 0.8808)
Negative Predictive Value0.8653(0.7726 - 0.9581)
Diagnostic Accuracy0.8165(0.7438 - 0.8891)
Likelihood ratio of a Positive Test3.8491(3.2870 - 4.5073)
Likelihood ratio of a Negative Test0.1769(0.1320 - 0.2370)
Diagnostic Odds21.7582(7.9370 - 59.6473)
Cohen's kappa (Unweighted)0.6341(0.4475 - 0.8207)
Entropy reduction after a Positive Test0.1541
Entropy reduction after a Negative Test0.2960
Bias Index0.0550
 

Cut-off point between level 4 and 5

 
ParameterEstimate95% CI

Sensitivity0.6470(0.5159 - 0.7782)
Specificity0.9655(0.9185 - 1.0124)
Positive Predictive Value0.9428(0.8659 - 1.0197)
Negative Predictive Value0.7567(0.6590 - 0.8545)
Diagnostic Accuracy0.8165(0.7438 - 0.8891)
Likelihood ratio of a Positive Test18.7647(6.8181 - 51.6440)
Likelihood ratio of a Negative Test0.3655(0.3274 - 0.4081)
Diagnostic Odds51.3333(11.1946 - 235.3899)
Cohen's kappa (Unweighted)0.6244(0.4453 - 0.8034)
Entropy reduction after a Positive Test0.4720
Entropy reduction after a Negative Test0.1363
Bias Index-0.1467
 
 

Level-specific Likelihood Ratios

 
 
Level 10.10330.0389 - 0.2746
Level 20.37900.0653 - 2.2000
Level 30.37900.0653 - 2.2000
Level 41.13720.7890 - 1.6390
Level 518.76476.8181 - 51.6440
 
Receiver Operator Characteristic (ROC) Curve
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
TP
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
FP
TP - True positive rate, FP - False positive rate
Area under the ROC curve = 0.8931 (0.8304 - 0.9558)











 

 

 

 


Print from the browser, or select all or part of the text and then copy and paste to other programs.
Many browsers have an optional setting to print background colors.