Performance of Two Screening Questionnaires for Inflammatory Arthritis in Patients with Inflammatory Bowel Disease

Table 2

Reliability parameters of the screening questionnaires.

Parameter	Axial Q versus clinical D	Per. Q versus clinical D	US versus clinical D
Sensitivity	87.5% (67.6–97.3)	82.8% (64.2–94.2)	50.5% (36.4–71.9)
Specificity	89.8% (81.5–92.2)	87.4% (79–93.3)	64.9 (53.2–75.4)
Positive LR	8.6 (4.5–16.2)	6.6 (3.8–11.4)	1.6 (1.1–2.4)
Negative LR	0.14 (0.05–0.4)	0.2 (0.09–0.4)	0.7 (0.5–1)
PPV	70% (50.6–85.3)	66.7% (49–81.4)	40% (25.7–55.7)
NPV	96.3% (89.7–99.2)	94.3% (87.2–98.1)	76.9% (64.8–88.5)

LR: likelihood ratio; Q: questionnaire; Per: peripheral; D: diagnosis; US: ultrasound; PPV: positive predictive value; NPV: negative predictive value.