Table 1 Baseline Characteristics in Overall Cohort by Surgical Approach
From: Laparoscopic versus open colectomy for colon cancer in an older population: a cohort study
Variable | LC (n = 424) | OC (n = 27,012) | P valuea |
|---|---|---|---|
Mean Age at Dx ± SD, years | 77.5 ± 7.3 | 77.9 ± 7.1 | 0.034 |
Female (%) | 234 (55.2) | 15,772 (58.4) | 0.185 |
Mean Charlson score ± SD | 0.31 ± 0.83 | 0.38 ± 0.90 | 0.099 |
Disabled (%) | 22 (5.2) | 1,743 (6.5) | 0.293 |
Weekend day admission (%) | 67 (15.8) | 4,334 (16.0) | 0.893 |
Race | |||
   White (%) | 370 (87.3) | 23,303 (86.3) |  |
   African-American (%) | 35 (8.3) | 1,985 (7.4) | 0.236 |
   Other (%) | 19 (4.5) | 1,724(6.4) |  |
Marital status | |||
   Married (%) | 210 (49.5) | 13,051 (48.3) |  |
   Separated/Not married (%) | 200 (47.2) | 12,939 (47.9) | 0.807 |
   Missing (%) | 14 (3.3) | 1,022 (3.8) |  |
Emergent presentation (%) | 12 (2.8) | 1,272 (4.7) | 0.069 |
Left-sided tumor (%) | 125 (29.5) | 10,016 (37.1) | 0.001 |
Large metro area (%) | 309 (72.9) | 14,775 (54.7) | < 0.001†|
Data for patient's census tract | |||
   Income,b $US | 56,075 ± 27,809 | 50,024 ± 22,898 | < 0.001 |
   Education levelc ± SD | 23.0 ± 9.6 | 27.4 ± 10.0 | < 0.001 |
   Mean census tract densityd ± SD | 2,247 ± 3,298 | 1,768 ± 2,661 | 0.003 |
   Census tract data imputed (%) | 28 (6.6) | 2,474 (9.2) | 0.070 |
Geographic region of SEER Registry | |||
   West (%) | 223 (52.6) | 9,286 (34.4) |  |
   Mountain (%) | 27 (6.4) | 1,490 (5.5) |  |
   Midwest (%) | 44 (10.4) | 6,807 (25.2) | < 0.001 |
   Northeast (%) | 75 (17.7) | 5,789 (21.4) |  |
   South (%) | 55 (13.0) | 3,640 (13.5) |  |
Hospital Characteristics | |||
   Teaching hospital (%) | 226 (53.3) | 13,515 (50.0) | 0.182 |
   Urban hospital (%) | 402 (94.8) | 23,256 (86.1) | < 0.001 |
   NCI Cancer Center (%) | 24 (5.7) | 728 (2.7) | < 0.001 |