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Table 6 T test or x 2 comparison of patients included (versus those excluded) and census tracts in Dallas County

From: Do neighborhood demographics, crime rates, and alcohol outlet density predict incidence, severity, and outcome of hospitalization for traumatic injury? A cross-sectional study of Dallas County, Texas, 2010

  Included N (%) or mean (95% CI) Excluded N (%) or mean (95% CI) p value
Patient-level variables n = 6,078 n = 161  
 Demographic information    
  Age 54.6 (54.0 to 55.2) 57.1 (53.7 to 60.6) 0.16
  Sex (male) 3,339 (54.8) 78 (48.5) 0.11
 Race/ethnicity    0.51
  White 3,099 (51.0) 89 (55.3)  
  Black 1,216 (20.0) 34 (21.1)  
  Hispanic/Latino 1,459 (24.0) 32 (19.9)  
  All other races 304 (5.0) 6 (3.7)  
 Healthcare/event data    
  Uninsured 1,618 (26.6) 25 (15.5) 0.002
  Alcohol intoxication 595 (9.8) 13 (8.1) 0.47
  Elixhauser Comorbidity Score 2.0 (2.0 to 2.1) 2.1 (1.9 to 2.4) 0.50
  Length of hospital stay (days) 5.6 (5.4 to 5.8) 4.6 (3.8 to 5.4) 0.02
  Trauma center admission 3,920 (64.5) 95 (59.0) 0.15
  Penetrating mechanism of injury 546 (10.8) 8 (5.8) 0.06
  TMPM, p(death) 0.05 (0.05 to 0.05) 0.04 (0.03 to 0.07) 0.14
  Died 191 (3.2) 3 (1.9) 0.35
Census tract-level variables n = 510 n = 16  
  Trauma/100,000 344.8 (328.2 to 361.4) 275.5 (220.1 to 331.0) 0.02
  Alcohol retail/100,000 49.4 (41.6 to 57.2) 41.7 (18.9 to 64.5) 0.51
  Population density 5,311.7 (4,944.2 to 5679.2) 4,146.5 (2,610.6 to 5,682.5) 0.14
  % Younger than 18 26.4 (25.7 to 27.1) 27.9 (24.4 to 31.4) 0.38
  % 65 and older 9.4 (8.8 to 9.9) 7.9 (6.1 to 9.7) 0.12
  % White race 58.5 (56.4 to 60.5) 62.7 (50.1 to 75.2) 0.49
  % Black race 21.2 (19.1 to 23.2) 23.5 (9.3 to 37.7) 0.74
  % Hispanic/Latino 35.8 (33.5 to 38.0) 36.7 (22.9 to 50.5) 0.89
  % High school graduates 76.1 (74.5 to 77.7) 73.5 (62.2 to 84.7) 0.64
  % Owner-occupied housing 54.3 (51.9 to 56.6) 60.7 (47.1 to 74.3) 0.34
  Median household income in thousands $55.9 (52.9 to 58.9) $53.5 (45.2 to 61.8) 0.58
  Living below poverty level 18.6 (17.4 to 19.7) 14.1 (9.3 to 21.0) 0.24
  Unemployment, age 20 to 64 years old 7.7 (7.3 to 8.1) 6.0 (4.7 to 7.2) 0.01