Table 1.
Study population characteristics
| Characteristic | Incident (n=575) | Center Effect (P Value) | Prevalent (n=384) | Center Effect (P Value) | Difference between Incident and Prevalent (P Value) |
|---|---|---|---|---|---|
| Age (yr) | 55.6±15.3 | 0.001 | 54.2±15.2 | 0.037 | NS |
| Women (%) | 38.4 | NS | 46.4 | NS | 0.05 |
| Korean (%) | 37.2 | 36.2 | NS | ||
| Body mass index (kg/m2) | 25.2±4.7 | <0.001 | 25.3±4.7 | <0.001 | NS |
| Total dialysate volume (L) | 7.96±1.29 | <0.001 | 8.38±1.87 | <0.001 | <0.001 |
| BP (mmHg) | 136±21/80±12 | <0.001 | 135±20/81±12 | NS | NS |
| Median duration of PD (d) | 40 (28, 55) | <0.001 | 360 (169, 609) | <0.001 | <0.001 |
| 4-hour PSTR | 0.71±0.12 | <0.001 | 0.71±0.12 | <0.001 | NS |
| Ultrafiltration capacity (ml) | |||||
| High (4% glucose) | 696.9±18.4 | <0.001 | 721.9±22.5 | 0.03 | <0.001 |
| Medium (2.5% glucose) | 229.3±17.6 | <0.001 | 248.6±17.0 | <0.001 | <0.001 |
| Albumin | 35.0±5.2 | <0.001 | 35.4±4.8 | 0.06 | NS |
| Hemoglobin | 11.0±2.2 | <0.001 | 11.2±1.8 | <0.001 | NS |
| Median urine volume (L) | 0.90 (0.46, 1.44) | <0.001 | 0.60 (0.19, 1.21) | 0.001 | <0.001 |
| Biocompatible solution use (%) | 19.3 | <0.001 | 16.1 | <0.001 | NS |
| Icodextrin solution use (%) | 19.1 | <0.001 | 28.0 | <0.001 | 0.002 |
| Comorbidity (low/intermediate/high) (%) | 35.6/56.8/7.6 | <0.001 | 43.9/48.5/7.6 | <0.001 | NS |
| Use of APD | 6.0 | <0.001 | 15.1 | <0.001 | <0.001 |
Values expressed with a plus/minus sign are the mean ± SD. Median values are accompanied by interquartile ranges in parentheses for skewed variable. NS, not significant.