Page 84 - Ultrasonography in Prehospital and Emergency Medicine - Rein Ketelaars

Diagnosis:
Correct
Incorrect
Total
Linear-array transducer
Curved-array transducer
Phased-array transducer
All transducers combined
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Chapter 3
McNemar’s test for clustered data showed no significant difference in diagnostic performance between the different transducers. (Linear- vs curved-array: p = .706, linear- vs phased-array: p = .537, curved- vs phased-array: p = .515)
Table 3.1 Cross tabulation of the number of correct and incorrect diagnoses compared between transducers
Curved-array transducer
Linear-array transducer
Total 321
Linear-array transducer Total
Curved-array transducer Total
Table 3.2
Sensitivity Specificity
Correct Incorrect
Phased-array transducer
309 12 321
7 2 9 316 14 330
7 320 2 10 9 330
Phased-array transducer
Correct 308 12 320
Incorrect 8 2 10 316 14 330
Correct 313 Incorrect 8
Diagnostic performance of the three ultrasound transducers for pneumothorax
97.5% 98.2% 98.8% 98.2% 97.6% 96.4% 97.5% 97.2%