Group

Sensitivity

Specificity

Positive predictive value

Negative predictive value

Diagnostic accuracy

Observation group (n = 5)

66.67 (4/6)

66.67 (2/3)

71.43 (5/7)

60.00 (3/5)

66.67 (6/9)

Control group (n = 4)

33.33 (2/6)

33.33 (1/3)

28.57 (2/7)

40.00 (2/5)

33.33 (3/9)

χ2

12.012

12.012

20.091

9.842

12.012

P

<0.001

<0.001

<0.001

<0.001

<0.001