Table 1 Baseline information for two groups of patients
Characteristics | Before PSM | After PSM | ||||||
|---|---|---|---|---|---|---|---|---|
LAP (N = 163) | NOSES (N = 188) | t/χ2 | P value | LAP (N = 106) | NOSES (N = 106) | t/χ2 | P value | |
Gender | 6.463 | 0.011 | 0.302 | 0.583 | ||||
Male | 95 (58.3%) | 104 (44.7%) | 54 (50.9%) | 50 (47.2%) | ||||
Female | 68 (41.7%) | 84 (55.3%) | 52 (49.1%) | 56 (52.8%) | ||||
Age (years) | 59.9 ± 11.1 | 59.5 ± 11.5 | 0.341 | 0.734 | 60.4 ± 11.0 | 59.3 ± 11.8 | 0.702 | 0.483 |
BMI (kg / m2) | 22.9 ± 3.1 | 22.1 ± 2.9 | 2.186 | 0.029 | 22.1 ± 2.8 | 22.4 ± 2.7 | -0.771 | 0.442 |
ASA grade | 1.062 | 0.303 | 1.759 | 0,185 | ||||
I/II | 132 (81.0%) | 160 (85.1%) | 93 (87.7%) | 86 (81.1%) | ||||
III | 31 (19.0%) | 28 (14.9%) | 13 (12.3%) | 20 (18.9%) | ||||
Location of the tumor from the anus | 13.603 | 0.001 | 3.940 | 0.139 | ||||
< 5 cm | 40 (24.5%) | 72 (38.3%) | 26 (24.5%) | 32 (30.2%) | ||||
5 ~ 10 cm | 97 (59.5%) | 75 (39.9%) | 64 (60.4%) | 50 (47.2%) | ||||
10 ~ 15 cm | 26 (16.0%) | 41 (21.8%) | 16 (15.1%) | 24 (22.6%) | ||||
Diameter of tumor | 4.643 | 0.031 | 0.196 | 0.658 | ||||
< 5 cm | 106 (17.6%) | 46 (15.4%) | 74 (69.8%) | 71 (67.0%) | ||||
> 5 cm | 57 (82.4%) | 142 (84.6%) | 32 (30.2%) | 35 (33.0%) | ||||
Preoperative CEA a | 2.520 | 0.112 | 0.147 | 0.701 | ||||
Positive | 21 (12.9%) | 36 (19.1%) | 15 (14.2%) | 17 (16.0%) | ||||
Negative | 142 (87.1%) | 152 (80.9%) | 91 (85.8%) | 89 (84.0%) | ||||
T Stage | 11.737 | 0.003 | 2.793 | 0.247 | ||||
Tis/T1 | 31 (19.0%) | 48 (25.5%) | 21 (19.8%) | 15 (14.2%) | ||||
T2 | 25 (15.3%) | 50 (26.6%) | 19 (17.9%) | 28 (26.4%) | ||||
T3 | 107 (65.6%) | 90 (47.9%) | 66 (62.3%) | 63 (59.4%) | ||||
N Stage | 2.729 | 0.099 | 0.097 | 0.755 | ||||
N0 | 113 (69.3%) | 145 (77.1%) | 79 (74.5%) | 77 (72.6%) | ||||
N1/N2 | 50 (30.7%) | 43 (22.9%) | 27 (25.5%) | 29 (27.4%) | ||||
Preoperative PFDI-20 scores | 7.53 ± 2.04 | 7.35 ± 1.64 | 0.910 | 0.364 | 7.35 ± 2.04 | 7.38 ± 1.69 | − 0.110 | 0.813 |