Table 1. Basic characteristics of the control individuals and patients with high altitude polycythemia.
| Variables | Han | Tibetan | ||
|---|---|---|---|---|
| Case (n=70) | Control (n=30) | Case (n=70) | Control (n=30) | |
| Sex | ||||
| Male | 35 | 15 | 35 | 15 |
| Female | 35 | 15 | 35 | 15 |
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