Table I.
Characteristics of 80 patients according to the RO differences.
| Difference RO | ||||
|---|---|---|---|---|
| Characteristics | ≤76 Watt/min | ≥77 Watt/min | Total | P-value |
| Total no. of patients | 59 | 21 | 80 | |
| Age, years | 0.301 | |||
| Median | 62 | 65 | 63 | |
| Range | 33–89 | 42–89 | 33–89 | |
| Sex, no. (%) | 0.056 | |||
| Female | 18 (30.5) | 2 (9.5) | 20 | |
| Male | 41 (69.5) | 19 (90.5) | 60 | |
| Distance to anal verge, no. (%) | 0.700 | |||
| 0–3.0 cm | 41 (69.5) | 13 (24.1) | 54 | |
| 3.1–5.0 cm | 11 (18.6) | 4 (26.7) | 15 | |
| ≥5.1 cm | 7 (11.9) | 4 (36.4) | 11 | |
| Tumor location, no. (%) | 0.457 | |||
| Ra | 6 (10.2) | 4 (19.0) | 10 | |
| Rb | 33 (55.9) | 10 (47.6) | 43 | |
| RbP | 20 (33.9) | 7 (33.4) | 27 | |
| Tumor stage, no. (%) | 0.284 | |||
| T2 | 14 (23.7) | 6 (28.6) | 20 | |
| T3 | 36 (61.0) | 9 (42.9) | 45 | |
| T4 | 9 (15.3) | 6 (28.6) | 15 | |
| Lymph node stage, no. (%) | 0.691 | |||
| N0 | 31 (52.5) | 9 (42.9) | 40 | |
| N1 | 26 (44.1) | 11 (52.4) | 37 | |
| N2 | 1 (1.7) | 1 (4.8) | 2 | |
| N3 | 1 (1.7) | 0 (0.0) | 1 | |
| Distant metastasis, no. (%) | 0.451 | |||
| M (−) | 53 (89.8) | 20 (95.2) | 73 | |
| M (+) | 6 (10.2) | 1 (4.8) | 7 | |
| Pretreatment TNM stage, no. (%) | 0.700 | |||
| Stage 1 | 8 (13.6) | 4 (19.0) | 12 | |
| Stage 2 | 19 (32.2) | 5 (23.8) | 24 | |
| Stage 3 | 26 (44.1) | 11 (52.4) | 37 | |
| Stage 4 | 6 (10.2) | 1 (4.8) | 7 | |
| Tumor differentiation, no. (%) | 0.157 | |||
| Well differentiated | 26 (44.1) | 11 (52.4) | 37 | |
| Moderately differentiated | 27 (45.8) | 9 (42.9) | 36 | |
| Poorly differentiated | 6 (10.2) | 0 (0.0) | 6 | |
| Undifferentiated | 0 (0.0) | 1 (4.8) | 1 | |
| Type of surgery, no. (%) | 0.985 | |||
| APR | 9 (15.3) | 3 (14.3) | 12 | |
| LAR | 10 (16.9) | 3 (14.3) | 13 | |
| sLAR | 11 (18.6) | 4 (19.0) | 15 | |
| ISR | 5 (8.5) | 2 (9.5) | 7 | |
| Local incision | 5 (8.5) | 1 (4.8) | 6 | |
| No resection | 1 (1.7) | 1 (4.8) | 2 | |
| No surgery | 18 (30.5) | 7 (33.3) | 25 | |
| BMI, SD | 23.6, 3.2 | 21.3, 3 | 0.001 | |
| Internal organs fat area (cm2), SD | 103.1, 55.8 | 72.9, 50.4 | 0.013 | |
ISR, intersphincteric resection; sLAR, super low anterior resection; LAR, low anterior resection; APR, abdominoperineal resection; SD, standard deviation; TNM, tumor node metastasis; BMI, body mass index.