. 2023 Oct 30;29(4):436–445. doi: 10.5056/jnm22142

Table 2.

Demographic Characteristics of Subjects

Subjects	HC	Mild ERD	Severe ERD	NERD	RH	FH
Sex^a (n = 149)	n = 15	n = 58	n = 17	n = 25	n = 15	n = 19
Male/female (69/80)	2/13	30/28	11/6	13/12	4/11	9/10
Age^b (n = 149)	n = 15	n = 58	n = 17	n = 25	n = 15	n = 19
43.4 ± 12.5 (mean ± SD, yr)	38.8 ± 8.5	43.6 ± 11.7	52.8 ± 11.5	44.7 ± 15.1	39.1 ± 11.5	39.4 ± 11.1
Body mass index^c (n = 149)	n = 15	n = 58	n = 17	n = 25	n = 15	n = 19
27.0 ± 4.9 (mean ± SD, kg/m²)	23.9 ± 2.9	28.4 ± 5.2	28.8 ± 4.1	27.3 ± 4.7	24.8 ± 4.5	25.3 ± 4.2
MNBI^d (n = 140) (mean ± SD, Ω)	n = 15	n = 51	n = 15	n = 25	n = 15	n = 19
MNBI^d (n = 140) (mean ± SD, Ω)	2489.3 ± 529.1	1166.6 ± 726.0	428.5 ± 211.0	1235.8 ± 695.0	2120.3 ± 740.2	2228.3 ± 724.1

^aPearson chi-square = 12.22, P = 0.032. Healthy control (HC) differs from severe erosive reflux disease (ERD).

^bKruskal-Wallis H = 14.11, P = 0.015. Pairwise comparison: severe ERD vs HC (P = 0.041), vs functional heartburn (FH) (P = 0.028).

^cKruskal-Wallis H = 24.53, P < 0.001. Pairwise comparison: severe ERD vs HC (P = 0.008), vs reflux hypersensitivity (RH) (P = 0.034). Mild ERD vs HC (P = 0.007), vs RH (P = 0.039).

^dKruskal-Wallis H = 70.68, P < 0.001. Pairwise comparison: severe ERD vs HC (P < 0.001), vs mild ERD (P = 0.014), vs nonerosive reflux disease (NERD) (P = 0.008), vs RH (P < 0.001), vs FH (P < 0.001). Mild ERD vs HC (P < 0.001), vs severe ERD (P = 0.014), vs RH (P = 0.005), vs FH (P < 0.001). NERD vs HC (P = 0.001), vs FH (P = 0.020).

MNBI, mean nocturnal baseline impedance.