Group

Sensitivity

Specificity

Positive predictive value

Negative predictive value

Diagnostic accuracy

Observation group (n = 4)

60.00 (3/5)

66.67 (2/3)

60.00 (3/5)

75.00 (3/4)

62.50 (5/8)

Control group (n = 5)

40.00 (2/5)

33.33 (1/3)

40.00 (2/5)

50.00 (2/4)

37.50 (3/8)

χ²

8.066

12.012

9.043

12.005

12.981

P

0.005

<0.001

<0.001

<0.001

<0.001