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Table 5 Full experimental data on the human scent discrimination by the dogs

From: Volatile organic compounds: instrumental and canine detections link an individual to the crime scene

 

Trials

Scent-article

Positive

True positive (TP)

False positive (FP)

PPV

Negative

True negative (TN)

False negative (FN)

NPV

Sensitivity

Specificity

Man A

200

Ceramic

194

190

4

97.94%

6

6

0

100.00%

100.00%

60.00%

200

Plastic

194

193

1

99.48%

6

6

0

100.00%

100.00%

85.71%

Man B

200

Ceramic

193

191

2

98.96%

7

6

1

85.71%

99.48%

75.00%

200

Plastic

198

198

0

100.00%

2

2

0

100.00%

100.00%

100.00%

Woman A

200

Treated wood

192

191

1

99.48%

8

7

1

87.50%

99.48%

87.50%

200

Wax

200

200

0

100.00%

0

0

0

 

100.00%

 

Woman B

200

Treated wood

196

195

1

99.49%

4

4

0

100.00%

100.00%

80.00%

200

Wax

199

199

0

100.00%

1

1

0

100.00%

100.00%

100.00%

  1. PPV = TP/(TP + FP); NPV = TN/(TN + FN); Sensitivity = TP/(TP + FN)*100; Specificity = TN/(TN + FP)*100