Table 1.
Baseline characteristics of patients before and after propensity score matching
| No. of patients | Before match | After match | ||||
|---|---|---|---|---|---|---|
| IBS (n = 365) | Controls (n = 1157) | p | IBS (n = 354) | Controls (n = 354) | p | |
| Age (median [IQR])† | 45 [33, 59] | 45 [35, 57] | 0.407 | 45 [36, 57] | 46 [35, 59] | 0.610 |
| BMI (median [IQR])† | 23.67 [21.46, 25.80] | 22.80 [20.94, 5.62] | 0.027* | 22.90 [20.97, 25.65] | 23.03 [20.98, 25.48] | 0.605 |
| Country (n, %) | < 0.001* | 1.000 | ||||
| USA | 175 (47.95) | 832 (71.91) | 175 (49.44) | 175 (49.44) | ||
| UK | 169 (46.30) | 274 (23.68) | 160 (45.20) | 160 (45.20) | ||
| Australia | 11 (3.01) | 19 (1.64) | 9 (2.54) | 9 (2.54) | ||
| Switzerland | 6 (1.64) | 12 (1.04) | 6 (1.69) | 6 (1.69) | ||
| Canada | 4 (1.10) | 20 (1.73) | 4 (1.13) | 4 (1.13) | ||
| Sex (n, %) | < 0.001* | 1.000 | ||||
| Female | 238 (65.21) | 488 (42.18) | 227 (64.12) | 227 (64.12) | ||
| Male | 127 (34.79) | 669 (57.82) | 127 (35.88) | 127 (35.88) | ||
IBS irritable bowel syndrome, BMI body weight index
†p value was derived from the Mann–Whitney test in data of continuous variables with abnormal distribution (M, Median; IQR, Interquartile Range). p value was derived from the Chi-square test or fisher’s exact test in data of categorical variables from IBS and healthy controls (n,%). *p < 0.05