Table 3. Frequency and median time to the first episode of peritonitis according to demographic factors.
| Variable | N | First PeritonitisFrequency(%) | Median Time tothe First Episode ofPeritonitis (months) | P value |
| Age (years) | ||||
| ≤65 | 934 | 250(26.8) | 13.9 | |
| >65 | 183 | 59(32.2) | 10.2 | 0.009 |
| Gender | ||||
| Women | 461 | 128(27.8) | 18.3 | |
| Men | 656 | 181(27.6) | 10.2 | 0.166 |
| Educational level | ||||
| ≥Senior middle school | 514 | 126(24.5) | 13.0 | |
| ≤Junior high school | 533 | 169(31.7) | 15.7 | 0.017 |
| Income (thousand RMB/per year) | ||||
| ≤50 | 786 | 218(27.7) | 16.0 | |
| >50 | 162 | 43(26.5) | 6.2 | 0.631 |
| Region where patients live | ||||
| Urban | 713 | 203(28.5) | 14.2 | |
| Rural | 393 | 102(26.0) | 10.9 | 0.865 |
| Catheter type, tip | ||||
| Straight | 961 | 263(27.4) | 11.8 | |
| Coiled | 149 | 44(29.5) | 18.2 | 0.279 |
| Previous hemodialysis | ||||
| Yes | 39 | 9(23.1) | 11.0 | |
| No | 1078 | 300(27.8) | 13.4 | 0.593 |
| Previous Kidney transplantation | ||||
| Yes | 9 | 3(33.3) | 14.6 | |
| No | 1108 | 306(27.6) | 13.2 | 0.971 |
| Operator | ||||
| Self | 1045 | 290(27.8) | 13.8 | |
| Else | 71 | 18(25.4) | 5.9 | 0.527 |