Variables | PANP (n = 518) | Control (n = 434) | χ2/T value | P value |
---|---|---|---|---|
Age, years | 58.61 ± 14.29 | 57.47 ± 13.51 | 1.26 | 0.21 |
Body mass index, kg/m2 | 22.16 ± 3.70 | 22.52 ± 3.55 | 1.53 | 0.13 |
Obstructiona | 51 (10.9 %) | 26 (6.4 %) | 4.72 | 0.03 |
Distance from the lower edge of the tumour to anus (cm) | 6.26 ± 2.86 | 6.01 ± 2.67 | 1.38 | 0.17 |
Tumour size (cm) | 0.06 | 0.87 | ||
≤5 | 101 (19.5 %) | 82 (18.9 %) | ||
>5 | 417 (80.5 %) | 352 (81.1 %) | ||
Laparoscopy | 262 (50.6 %) | 240 (55.3 %) | 2.11 | 0.15 |
Dukes stageb | 1.97 | 0.16 | ||
A | 106 (20.9 %) | 88 (20.3 %) | ||
B | 214 (41.3 %) | 160 (36.9 %) | ||
C | 113 (22.3 %) | 114 (26.3 %) | ||
D | 73 (14.4 %) | 72 (16.6 %) | ||
Histological grade | 2.55 | 0.28 | ||
Well differentiated | 184 (35.5 %) | 136 (31.3 %) | ||
Moderately differentiated | 232 (44.8 %) | 216 (49.8 %) | ||
Poorly differentiated | 102 (19.7 %) | 82 (18.9 %) | ||
Surgical approach | 1.77 | 0.19 | ||
Low anterior resection | 130 (25.1 %) | 93 (21.4 %) | ||
Abdominoperineal resection | 388 (74.9 %) | 341 (78.6 %) |