Table 1.
Menstrual history of patients with POTS and healthy controls
| POTS (n=65) | Controls (n=92) | P value | |
|---|---|---|---|
| Age at menarche, y a | 12.7 ± 0.9 | 12.7 ± 1.3 | 0.727 |
| How far apart are/were periods b | 3 (2,3) | 3 (2,3) | 0.671 |
| Duration of bleeding b | 2 (2,3) | 2 (2,3) | 0.451 |
| Severity of heaviest blood flow b | 2 (2,3) | 2 (2,3) | 0.153 |
| Duration of heaviest blood flow b | 1 (1,2) | 1 (1,1) | 0.051 |
| Length of irregular pattern of bleeding b | 2 (2,4) | 3 (2,4) | 0.101 |
Abbreviation: POTS, postural tachycardia syndrome.
a
Values are given as mean ± SEM and were analyzed via Student t test.
b
Values are given as median (25th, 75th percentile) and were analyzed via Mann–Whitney U test. Values were on a Likert scale where 1 represented the minimal severity or duration, and 5 represented the worst. One patient with POTS did not provide an answer.