Low-dose amitriptyline combined with proton pump inhibitor for functional chest pain

Table 1 Baseline characteristics of the intention to treat population

Variables	Group		P value
	A (n = 20)	B (n = 20)
Age (yr)	51.1 ± 8.5	49.7 ± 9.59	0.628
Gender (female)	11 (55)	12 (60)	0.749
Alcohol	3 (15)	4 (20)	0.677
Smoking	4 (20)	9 (45)	0.091
BMI (kg/m2)	21.56 ± 1.74	21.79 ± 2.2	0.716
Region (rural)	9 (52.94)	7 (36.84)	0.332
Symptom index1	5 (25)	5 (25)	-
Acid exposure time	0.52% ± 0.68%	0.44% ± 0.8%	0.719
Baseline BDI	6.9 ± 2.22	7.35 ± 1.93	0.498

Data are expressed as absolute numbers (percentage) or mean ± SD.

¹Symptom index indicated number of patients who has score of symptom index by > 50% on 24-h esophageal pH monitoring. BMI: Body mass index; BDI: Beck Depression Inventory.