Table 5 The characteristics of respondents in matched group and unmatched group
Matched group (n = 202) | Unmatched group (n = 3191) | P | |
|---|---|---|---|
Years of experience (practice as urologist), n (%) | 0.714 | ||
< 1 year | 4 (2.0) | 108 (3.4) | |
1–3 years | 15 (7.4) | 204 (6.4) | |
4–5 years | 19 (9.4) | 254 (8.0) | |
6–10 years | 40 (19.8) | 676 (21.2) | |
> 10 years | 124 (61.4) | 1949 (61.1) | |
Surgical experience of PCNL per year, n (%) | 0.012 | ||
< 10 cases | 25 (12.4) | 538 (16.9) | |
10–50 cases | 74 (36.6) | 1307 (41.0) | |
51–100 cases | 46 (22.8) | 732 (22.9) | |
> 100 cases | 57 (28.2) | 614 (19.2) | |
Grade of attaching medical unit, n (%) | 0.001 | ||
Tertiary hospital | 156 (77.2) | 2187 (68.5) | |
Non-tertiary hospital | 46 (22.8) | 1004 (31.5) | |
University hospital, n (%) | 0.285 | ||
Yes | 105 (52.0) | 1535 (48.1) | |
No | 97 (48.0) | 1656 (51.9) | |
Geographical area, n (%) | 0.292 | ||
East China | 10 (5.0) | 213 (6.7) | |
North China | 29 (14.4) | 437 (13.7) | |
Central China | 42 (20.8) | 735 (23.0) | |
South China | 30 (14.9) | 558 (17.5) | |
Northeast China | 19 (9.4) | 320 (10.0) | |
Northwest China | 21 (10.4) | 348 (10.9) | |
Southwest China | 51 (25.2) | 580 (18.2) | |