Table 1

Demographic case mix and outcomes stratified by insurance status (N=9551)

VariableTotal
n (%)
Privately insured patients (n=1134, 11.87%)
n (%)
Self-paid patients (n=8417, 88.13%)
n (%)
P value
Sex
 Male5147 (53.89)615 (54.23)4532 (53.84)0.908
 Female4403 (46.10)519 (45.77)3884 (46.14)
Age (years)0.181
 60–695230 (54.76)643 (56.70)4587 (54.50)
 70–793147 (32.95)369 (32.54)2778 (33.00)
 ≥801174 (12.29)122 (10.76)1052 (12.50)
Residency<0.001**
 Outside city1524 (15.96)94 (8.29)1430 (16.99)
 Within city8027 (84.04)1040 (91.71)6987 (83.01)
Admission source<0.001**
 Consultant clinics4468 (46.78)588 (51.85)3880 (46.10)
 Emergency room5083 (53.22)546 (48.15)4537 (53.90)
Charlson Comorbidity Index categories0.001*
 0 (none)3027 (31.69)424 (37.39)2603 (30.93)
 1 (mild)4291 (44.93)490 (43.21)3801 (45.16)
 2 (moderate)1044 (10.93)103 (9.08)941 (11.18)
 3 (severe)1189 (12.45)117 (10.32)1072 (12.74)
Surgical intervention0.003*
 Operated6134 (64.22)773 (68.17)5361 (63.69)
 Non-operated3417 (35.78)361 (31.83)3056 (36.31)
Presence of complications4039 (42.29)412 (36.33)3627 (43.09)<0.001**
Pulmonary complications384 (1.02)37 (3.26)347 (4.12)0.166
Surgical site infections1197 (12.53)130 (11.46)1067 (12.68)0.247
Acute renal failure1249 (13.08)118 (10.41)1131 (13.44)0.004*
Urinary tract infections485 (5.08)51 (4.50)434 (5.16)0.343
Deep vein thrombosis/pulmonary embolism/thrombophlebitis†85 (0.89)3 (0.26)82 (0.97)0.011*
Acute myocardial infarction320 (3.35)30 (2.65)290 (3.45)0.160
Sepsis3289 (34.44)348 (30.69)2941 (34.94)0.005*
Septic shock1385 (14.50)130 (11.46)1255 (14.91)0.002*
Cardiac arrest339 (3.55)33 (2.91)306 (3.64)0.215
Pneumonia†313 (3.28)29 (2.56)284 (3.37)0.147
Stroke†32 (0.34)4 (0.35)28 (0.33)0.787
Coma†27 (0.28)2 (0.18)25 (0.30)0.764
Hemorrhage340 (3.56)28 (3.35)302 (3.59)0.686
Gastrointestinal bleeding319 (3.34)36 (3.17)283 (3.36)0.741
Deaths376 (3.94)35 (3.09)341 (4.05)0.117
Mean survival time (days)22.6023.650.04*
  • χ2 test for independence applied.

  • For simplicity of the table, frequencies of the category “without complication” are not presented.

  • *P<0.05, **P<0.001.

  • †Fisher exact test applied.