Table 2.

Accuracy, Confidence, and Test Characteristics, Without and With Photos

	Without photo	With photo	p Value
Accuracy, numerator/denominator (%)
SSI	75/122 (61.5)	74/115 (64.3)	0.24
SSI (ambiguous)	65/128 (50.8)	73/121 (60.3)	0.13
Not SSI (ambiguous)	86/128 (67.2)	105/123 (85.4)	<0.001
Not SSI	94/103 (91.3)	97/99 (98.0)	0.109
Overall	320/481 (66.5)	349/458 (76.2)	<0.001
Confidence, mean (SD), 0-10 scale
SSI	5.8 (1.6)	6.7 (1.9)	<0.001
SSI (ambiguous)	5.9 (1.8)	7.2 (1.9)	<0.001
Not SSI (ambiguous)	5.8 (2.1)	7.6 (1.9)	<0.001
Not SSI	6.3 (1.8)	8.4 (1.6)	<0.001
Correct diagnosis (SSI)	6.1 (1.7)	7.2 (1.8)	<0.001
Incorrect diagnosis (SSI)	5.7 (2.9)	6.7 (3.4)	<0.001
Correct diagnosis (not SSI)	6.3 (1.8)	8.3 (1.7)	<0.001
Incorrect diagnosis (not SSI)	6.0 (2.7)	6.6 (2.1)	0.82
Overall	6.1 (1.8)	7.6 (1.9)	<0.001
Test characteristics, %
Sensitivity	56.0	62.3	0.16
Specificity	77.9	91.0	<0.001
Positive predictive value	73.3	88.0	<0.001
Negative predictive value	62.1	69.4	0.06

SSI, surgical site infection.