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Analysis of first detection method in different stages (n, %)
| Stages | Routine screening | Nonscreening | All patients |
|---|---|---|---|
| I | 269 (70.6)* | 641 (34.8) | 910 (40.9) |
| II–IV | 112 (29.4) | 1202 (65.2) | 1314 (59.1) |
| Total | 381 (100) | 1843 (100) | 2224 (100) |
*Chi-square test, P<0.01
