Table 1.
Baseline characteristics by elevation group
| Variable | Low altitude (n = 557) | High altitude (n = 163) | P-value |
|---|---|---|---|
| Age (years), median (range)a | 51.8 (18.1–94.4) | 56.8 (18.2–98.3) | <0.001 |
| Sex, n (%)b,c | |||
| Men | 297 (61.2) | 104 (63.8) | 0.559 |
| Women | 188 (38.8) | 59 (36.2) | |
| Cause of ESKD, n (%)b | |||
| Hypertension | 172 (30.9) | 52 (31.9) | <0.001 |
| Diabetes | 119 (21.4) | 24 (14.7) | |
| Glomerulonephritis | 86 (15.4) | 12 (7.4) | |
| Other | 88 (15.8) | 21 (12.9) | |
| Undetermined | 13 (2.3) | 10 (6.1) | |
| Mixed | 2 (0.4) | 12 (7.4) | |
| Not filed | 77 (13.8) | 32 (19.6) | |
| Hemoglobin (g/dL), median (range)a,d | 9.0 (4.0–16.4) | 8.3 (3.6–18.7) | 0.009 |
| Follow-up (years), median (range) | 3.9 (0.3–5.0) | 2.4 (0.2–5.0) | < 0.001 |
a
Wilcoxon rank-sum test.
b
Chi-squared test.
c
Information available in 648 records.
d
Baseline hemoglobin was determined in 54% of the patients: 309 patients in the low-altitude group and 86 patients in the high-altitude group.