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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
  1. a P value from independent sample t-tests for continuous variables or chi-square tests for categorical variables
  2. bCensus tract median income
  3. cMean % of individuals with high school only education in the census tract
  4. dIn persons per square kilometer