Table 2.

Sensitivity and specificity of CDQ and GerdQ for the diagnosis of reflux oesophagitis among the mail-survey population (n = 303)

	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	AUC	p-value
CDQ ≥ 6	51.4	61.9	15.0	90.7	0.567	0.14
GerdQ ≥ 6	88.6	14.6	11.9	90.7	0.516	0.80
GerdQ ≥ 7	42.9	70.5	16.0	90.4	0.567	0.12
GerdQ ≥ 8	34.3	82.5	20.3	90.6	0.584	0.02
GerdQ ≥ 9	17.1	89.6	17.6	89.2	0.533	0.25

p-values calculated using Fisher’s Exact test.

CDQ, Carlsson-Dent questionnaire; PPV, positive predictive value; NPV, negative predictive value; AUC, area under the curve.