Table 4.
Clinicopathological characteristics before and after propensity score matching
| Variable | All patients | Matched patients | ||||
|---|---|---|---|---|---|---|
| Low SMI (n = 68) |
Normal (n = 145) |
P-value | Low SMI (n = 39) |
Normal (n = 39) |
P-value | |
| Sex | ||||||
| Male | 23 (33.8%) | 103 (71.0%) | 21 (53.8%) | 17 (43.6%) | ||
| Female | 45 (66.2%) | 42 (29.0%) | < 0.001 | 18 (46.2%) | 22 (56.4%) | 0.497 |
| Age (years)* | ||||||
| Mean (SD) | 73.1 (11.2) | 68.4 (11.0) | 0.004 | 72.9 (12.3) | 70.7 (10.9) | 0.401 |
| BMI* | ||||||
| Mean (SD) | 20.6 (3.3) | 24.4 (3.8) | < 0.001 | 21.5 (3.67) | 21.7 (2.32) | 0.825 |
| PNI* | ||||||
| Mean (SD) | 45.3 (6.3) | 47.0 (6.5) | 0.076 | 45.7 (6.94) | 46.7 (5.82) | 0.512 |
| GPS | ||||||
| 0.1 | 64 (94.1%) | 132 (91.0%) | 36 (92.3%) | 35 (89.7%) | ||
| 2 | 4 (5.9%) | 13 (9.0%) | 0.591 | 3 (7.7%) | 4 (10.3%) | 1.000 |
| Alb (g/dL)* | ||||||
| Mean (SD) | 3.79 (0.5) | 3.88 (0.5) | 0.268 | 3.81 (0.5) | 3.87 (0.5) | 0.643 |
| Cardiac disease | ||||||
| Positive | 9 (13.2%) | 28 (19.3%) | ||||
| Negative | 59 (86.8%) | 117 (80.7%) | 0.334 | |||
| Lung disease | ||||||
| Positive | 12 (17.6%) | 11 (7.6%) | 8 (20.5%) | 6 (15.4%) | ||
| Negative | 56 (82.4%) | 134 (92.4%) | 0.034 | 31 (79.5%) | 33 (84.6%) | 0.769 |
| Diabetes mellitus | ||||||
| Positive | 7 (10.3%) | 39 (26.9%) | 6 (15.4%) | 7 (17.9%) | ||
| Negative | 61 (89.7%) | 106 (73.1%) | 0.007 | 33 (84.6%) | 32 (82.1%) | 1.000 |
| Tumor location | ||||||
| Rectum | 21 (30.9%) | 59 (40.7%) | 13 (33.3%) | 16 (41.0%) | ||
| Others | 47 (69.1%) | 86 (59.3%) | 0.176 | 26 (66.7%) | 23 (59.0%) | 0.640 |
| Tumor size (cm) | ||||||
| < 3.0 | 25 (38.5%) | 58 (41.1%) | 24 (63.2%) | 21 (55.3%) | ||
| ≧3.0 | 40 (61.5%) | 83 (58.9%) | 0.761 | 14 (36.8%) | 17 (44.7%) | 0.641 |
| pT stage | ||||||
| ≧3 | 40 (58.8%) | 80 (55.2%) | 24 (61.5%) | 21 (53.8%) | ||
| 0–2 | 28 (41.2%) | 65 (44.8%) | 0.658 | 15 (38.5%) | 18 (46.2%) | 0.647 |
| pN stage | ||||||
| Positive | 23 (33.8%) | 37 (25.5%) | 12 (30.8%) | 10 (25.6%) | ||
| Negative | 45 (66.2%) | 108 (74.5%) | 0.253 | 27 (69.2%) | 29 (74.4%) | 0.802 |
| P | ||||||
| Positive | 4 (5.9%) | 4 (2.8%) | 2 (5.1%) | 2 (5.1%) | ||
| Negative | 64 (94.1%) | 141 (97.2%) | 0.270 | 37 (94.9%) | 37 (94.9%) | 1.000 |
| H | ||||||
| Positive | 4 (5.9%) | 8 (5.5%) | 2 (5.1%) | 3 (7.7%) | ||
| Negative | 64 (94.1%) | 137 (94.5%) | 1.000 | 37 (94.9%) | 36 (92.3%) | 1.000 |
| Surgical procedure | ||||||
| Open | 11 (16.2%) | 15 (10.3%) | 6 (15.4%) | 4 (10.3%) | ||
| Lap | 57 (83.8%) | 130 (89.7%) | 0.263 | 33 (84.6%) | 35 (89.7%) | 0.737 |
| Stoma | ||||||
| Positive | 8 (11.8%) | 23 (15.9%) | 6 (15.4%) | 4 (10.3%) | ||
| Negative | 60 (88.2%) | 122 (84.1%) | 0.534 | 33 (84.6%) | 35 (89.7%) | 0.737 |
| Operative Time (min) | ||||||
| > 240 | 34 (50.0%) | 69 (47.6%) | 20 (51.3%) | 16 (41.0%) | ||
| ≦240 | 34 (50.0%) | 76 (52.4%) | 0.770 | 19 (48.7%) | 23 (59.0%) | 1.000 |
| Bleeding (ml) | ||||||
| ≧101 | 12 (17.6%) | 28 (19.3%) | 6 (15.4%) | 6 (15.4%) | ||
| < 101 | 56 (82.4%) | 117 (80.7%) | 0.852 | 33 (84.6%) | 33 (84.6%) | 0.496 |
Bold text indicates a statistically significant difference with a P-value < 0.05
Continuous parameters are presented as mean (SD)*, and categorical parameters are presented as n (%), P < 0.05