Table 1.
Baseline characteristics of the study population
| Characteristic | POTS- (n = 283) |
POTS+ (n = 113) |
P-value |
|---|---|---|---|
| Age (years) | 31.5 (9.8) | 26.3 (8.4) | < 0.001 |
| Female sex, n (%) | 189 (66.8) | 83 (73.5) | 0.241 |
| BMI, Kg/m2 | 24.3 (4.1) | 22.7 (3.5) | < 0.001 |
| SBP supine, mmHg | 119.9 (14.2) | 120.4 (14.2) | 0.833 |
| DBP supine, mmHg | 69.9 (8.2) | 70.2 (8.2) | 0.788 |
| HR supine, bpm | 68.7 (11.9) | 71.1 (11.6) | 0.084 |
| SBP HUT min, mmHg | 112.2 (13.4) | 107.6 (16.2) | 0.003 |
| DBP HUT min, mmHg | 71.8 (9.1) | 72.5 (10.6) | 0.552 |
| HR HUT max, bpm | 84.7 (13.8) | 112.4 (15.6) | < 0.001 |
| Smoking, n (%) | 58 (20.5) | 16 (14.2) | 0.188 |
P-values for differences between the groups are shown as mean and SD for continuous variables and as percentages for categorical variables.; DBP Diastolic blood pressure; HR Heart rate; HUT min/max, lowest/highest value during passive head-up tilt test; IHD Ischemic heart disease; POTS Postural orthostatic tachycardia syndrome; SBP Systolic blood pressure