Table 1.
Baseline demographic and clinical characteristics of the study participants.
| Characteristics | Values |
|---|---|
| Participants (n) | 115 |
| Age (years) | 12.0 (10.0, 13.0) |
| Gender (n, male/female) | 50/65 |
| Body mass index (kg/m2) | 17.4 (16.1, 19.8) |
| Duration of symptoms before treatment (months) | 10.5 (2.0, 36.0) |
| MEDICAL HISTORY | |
| Predisposing factors (n, yes/no) | 77/38 |
| Syncope (n, yes/no) | 61/54 |
| Symptom scores before treatment (points) | 4 (3, 7) |
| PERSONAL HISTORY | |
| Motion sickness (n, yes/no) | 16/99 |
| Allergic diseases (n, yes/no) | 29/86 |
| Family history about OI (n, yes/no) | 29/86 |
| CHARACTERISTICS IN STANDING-UP TEST | |
| Supine heart rate (bpm) | 74 ± 11 |
| Maximum upright heart rate (bpm) | 121 ± 14 |
| Changes of heart rate (bpm) | 46 (40, 53) |
| ITEMS OF BLOOD ROUTINE TEST | |
| Mean corpuscular hemoglobin concentration (g/L) | 347 (339, 354) |
| Platelet (*109/L) | 257 (229, 298) |
| 24 h urinary sodium excretion (mmol/24 h) | 102 (73, 135) |
| Duration of treatment (months) | 3.5 (3, 5) |
OI, orthostatic intolerance. Continuous data with normal distribution are presented as mean ± standard deviation, otherwise as median (P25, P75) and categorical variables are summarized as numbers.