Before matching, n (%) | P | After matching, n (%) | P | |||
---|---|---|---|---|---|---|
Left colon, n=25,094 | Right colon, n=45,156 | Left colon, n=5118 | Right colon, n=5118 | |||
Age, years (median) | 65 | 72 | <0.01 | 66 | 66 | 0.91 |
Age groups | <0.01 | 0.86 | ||||
<50 | 3057 (12.18) | 2770 (6.13) | 626 (12.23) | 608 (11.88) | ||
50–69 | 12,296 (49.00) | 16,350 (36.21) | 2428 (47.44) | 2438 (47.64) | ||
≥70 | 9741 (38.82) | 26,036 (57.66) | 2064 (40.33) | 2072 (40.48) | ||
Sex | <0.01 | 0.74 | ||||
Male | 13,451 (53.60) | 20,708 (45.86) | 2720 (53.15) | 2738 (53.50) | ||
Female | 11,634 (46.36) | 24,448 (54.14) | 2398 (46.85) | 2380 (46.50) | ||
Race | <0.01 | 0.29 | ||||
White | 19,297 (76.90) | 36,705 (81.28) | 3995 (78.06) | 4041 (78.96) | ||
Black | 2934 (11.69) | 5382 (11.92) | 591 (11.55) | 586 (11.45) | ||
Others | 2756 (10.98) | 2935 (6.50) | 518 (10.12) | 484 (9.45) | ||
Unknown | 107 (0.43) | 134 (0.30) | 14 (0.27) | 7 (0.14) | ||
Grade | <0.01 | 0.66 | ||||
I | 2329 (9.28) | 3858 (8.54) | 506 (9.89) | 525 (10.26) | ||
II | 19,469 (77.58) | 31,131 (68.94) | 3882 (75.85) | 3892 (76.05) | ||
III | 2802 (11.17) | 8288 (18.35) | 643 (12.56) | 627 (12.25) | ||
IV | 494 (1.97) | 1879 (4.16) | 87 (1.70) | 74 (1.44) | ||
T | <0.01 | 0.73 | ||||
T1 | 4402 (17.54) | 5879 (13.02) | 912 (17.82) | 895 (17.49) | ||
T2 | 4019 (16.02) | 7938 (17.58) | 843 (16.47) | 855 (16.71) | ||
T3 | 13,407 (53.43) | 25,277 (55.98) | 2765 (54.03) | 2801 (54.73) | ||
T4 | 3266 (13.02) | 6062 (13.42) | 598 (11.68) | 567 (11.07) | ||
N | <0.01 | 0.54 | ||||
N0 | 15,479 (61.68) | 29,242 (64.76) | 3184 (62.21) | 3226 (63.03) | ||
N1 | 6684 (26.64) | 10,350 (22.92) | 1336 (26.10) | 1327 (25.93) | ||
N2 | 2931 (11.68) | 5564 (12.32) | 598 (11.69) | 565 (11.04) | ||
Stage | <0.01 | 0.85 | ||||
I | 6938 (27.65) | 11,912 (26.38) | 1458 (28.49) | 1469 (28.70) | ||
II | 8541 (34.04) | 17,330 (38.38) | 1726 (33.72) | 1757 (34.33) | ||
III | 9615 (38.32) | 15,914 (35.24) | 1934 (37.79) | 1892 (36.97) |