Group

Sensitivity

Specificity

Positive predictive value

Negative predictive value

Diagnostic accuracy

Observation group (n = 8)

70.00 (7/10)

50.00 (2/4)

88.89 (8/9)

66.67 (4/6)

64.29 (9/14)

Control group (n = 8)

40.00 (4/10)

25.00 (1/4)

55.56 (5/9)

33.33 (2/6)

35.71 (5/14)

χ²

14.871

12.092

15.872

12.012

14.831

P

<0.001

<0.001

<0.001

<0.001

<0.001