Table 3 Demographics and pathologic characteristics of patients undergoing low anterior resection before and after propensity score matching
Unmatched low anterior resection dataset | 1:1 Matched low anterior resection dataset | |||||||
|---|---|---|---|---|---|---|---|---|
Laparoscopic | Robotic | SMD | p§ | Laparoscopic | Robotic | SMD | p‡ | |
Sample size | 12,172 | 4854 | 4854 | 4854 | ||||
Age, years | < 0.01* | 0.52 | ||||||
18–40 | 559 (4.6) | 250 (5.2) | 0.026 | 227 (4.7) | 250 (5.2) | 0.022 | ||
41–60 | 5106 (41.9) | 2318 (47.8) | 0.117 | 2353 (48.5) | 2318 (47.8) | 0.014 | ||
61–80 | 5682 (46.7) | 2059 (42.4) | 0.086 | 2062 (42.5) | 2059 (42.4) | 0.001 | ||
> 80 | 825 (6.8) | 227 (4.7) | 0.091 | 212 (4.4) | 227 (4.7) | 0.015 | ||
Sex | < 0.01* | 0.31 | ||||||
Female | 5136 (42.2) | 1905 (39.2) | 0.060 | 1954 (40.3) | 1905 (39.2) | 0.021 | ||
Male | 7036 (57.8) | 2949 (60.8) | 0.060 | 2900 (59.7) | 2949 (60.8) | 0.021 | ||
Race/ethnicity | < 0.01* | 0.18 | ||||||
White | 7018 (57.7) | 3799 (78.3) | 0.453 | 3869 (79.7) | 3799 (78.3) | 0.035 | ||
Black or AA | 724 (5.9) | 329 (6.8) | 0.034 | 312 (6.4) | 329 (6.8) | 0.014 | ||
Asian | 705 (5.8) | 346 (7.1) | 0.054 | 303 (6.2) | 346 (7.1) | 0.035 | ||
Other | 3725 (30.6) | 380 (7.8) | 0.604 | 370 (7.6) | 380 (7.8) | 0.008 | ||
Hispanic | 654 (5.4) | 331 (6.8) | 0.060 | 316 (6.5) | 331 (6.8) | 0.012 | ||
BMI | < 0.01* | 0.13 | ||||||
< 18 | 211 (1.7) | 65 (1.3) | 0.032 | 46 (0.9) | 65 (1.3) | 0.037 | ||
18–25 | 3500 (28.8) | 1319 (27.2) | 0.035 | 1274 (26.2) | 1319 (27.2) | 0.021 | ||
25–30 | 4322 (35.5) | 1664 (34.3) | 0.026 | 1665 (34.3) | 1664 (34.3) | 0.001 | ||
> 30 | 4139 (34.0) | 1806 (37.2) | 0.067 | 1869 (38.5) | 1806 (37.2) | 0.027 | ||
ASA Classification | < 0.01* | 0.58 | ||||||
Class 1 | 302 (2.5) | 63 (1.3) | 0.087 | 49 (1.0) | 63 (1.3) | 0.027 | ||
Class 2 | 5263 (43.2) | 2135 (44.0) | 0.015 | 2142 (44.1) | 2135 (44.0) | 0.003 | ||
Class 3 | 6105 (50.2) | 2535 (52.2) | 0.041 | 2563 (52.8) | 2535 (52.2) | 0.012 | ||
Class 4 | 502 (4.1) | 121 (2.5) | 0.091 | 100 (2.1) | 121 (2.5) | 0.029 | ||
Pathologic T stage | < 0.01* | 0.69 | ||||||
T1 | 1406 (11.6) | 561 (11.6) | 0.001 | 574 (11.8) | 561 (11.6) | 0.008 | ||
T2 | 2460 (20.2) | 1139 (23.5) | 0.079 | 1096 (22.6) | 1139 (23.5) | 0.021 | ||
T3 | 5395 (44.3) | 2027 (41.8) | 0.052 | 2072 (42.7) | 2027 (41.8) | 0.019 | ||
T4 | 943 (7.7) | 260 (5.4) | 0.097 | 265 (5.5) | 260 (5.4) | 0.005 | ||
Other | 1968 (16.2) | 867 (17.9) | 0.045 | 847 (17.4) | 867 (17.9) | 0.011 | ||
Mechanical bowel prep | 0.74 | 0.31 | ||||||
Yes | 9093 (74.7) | 3638 (74.9) | 0.006 | 3681 (75.8) | 3638 (74.9) | 0.021 | ||
No | 3079 (25.3) | 1216 (25.1) | 0.006 | 1173 (24.2) | 1216 (25.1) | 0.021 | ||
Antibiotic bowel prep | < 0.01* | 0.75 | ||||||
Yes | 7097 (58.3) | 3389 (69.8) | 0.242 | 3375 (69.5) | 3389 (69.8) | 0.006 | ||
No | 5075 (41.7) | 1465 (30.2) | 0.242 | 1479 (30.5) | 1465 (30.2) | 0.006 | ||