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. 2013 Oct 21;3:22. doi: 10.1186/2191-1991-3-22

Table 4.

Sensitivity analyses, patient level

Variable name Parameter estimate (2009 EURO’s) Standard error t value Probability of estimate = 0
Sensitivity analysis 1: Only the first discharge per patient per year is included
Department 1
 696
 618
 1.13
 0.2599
Department 2
 668
 658
 1.02
 0.3096
Department 3
 −298
 549
 −0.54
 0.5875
Department 4
 −915
 540
 −1.70
 0.0899
Department 5
 −1,044
 544
 −1.92
 0.0551
Department 6
 1,588*
 540
 2.94
 0.0033
Department 7
 −1,152
 905
 −1.27
 0.2034
Department 8
 1,157*
 555
 2.08
 0.0372
Department 9
 49
 558
 0.09
 0.9300
2006
 480
 263
 1.82
 0.0682
2007
 1,888*
 229
 8.25
 < .0001
2008
 495*
 249
 1.99
 0.0465
2009
 1,206*
 232
 5.19
 < .0001
DRG index
 4,395*
 249
 17.65
 < .0001
DRG index squared
 744*
 52
 14.32
 < .0001
Age less than 50
 48
 275
 0.18
 0.8610
Age 50-60
 137
 234
 0.59
 0.5585
Age 70-80
 178
 186
 0.96
 0.3375
Age 80-90
 86
 242
 0.35
 0.7227
Age 90+
 −1,344*
 668
 −2.01
 0.0444
Woman
 −534*
 151
 −3.53
 0.0004
Daily smoker
 −100
 96
 −1.04
 0.2983
BMI information missing
 1,440*
 459
 3.14
 0.0017
Underweight
 −272
 449
 −0.61
 0.5451
Overweight
 37
 198
 0.19
 0.8519
Obese
 380
 267
 1.42
 0.1542
Very obese
 −1,505
 946
 −1.59
 0.1116
Diabetes
 −225
 108
 −2.08
 0.0380
Cerebral comorbidity
 −159
 84
 −1.89
 0.0589
Hypertension
 −380*
 126
 −3.01
 0.0026
Cardiac comorbidity
 20
 54
 0.37
 0.7107
Pulmonary comorbidity
 590*
 181
 3.26
 0.0011
Very acute admission
 2,748*
 575
 4.78
 < .0001
Acute admission
 1,247
 334
 3.74
 0.0002
Elective
 896
 311
 2.88
 0.0040
Severity information missing
 −126
 420
 −0.30
 0.7640
Moderate (ASA = 2)
 −524*
 207
 −2.53
 0.0113
Severe (ASA = 3)
 −335
 245
 −1.37
 0.1718
Very severe/fatal (ASA > 3)
 1,586*
 468
 3.39
 0.0007
Lenght of stay
 646*
 11
 58.20
 < .0001
30 days mortality
 4,113*
 426
 9.66
 < .0001
No. observations
 19,185
  
  
  
Model diagnostics (R 2 )
 0.63
  
  
  
Sensitivity analysis 2: All observations are included
Department 1 d1
 1,084
 597
 1.81
 0.0697
Department 2
 883
 643
 1.37
 0.1696
Department 3
 −156
 528
 −0.30
 0.7672
Department 4
 −636
 525
 −1.21
 0.2255
Department 5
 −755
 530
 −1.43
 0.1541
Department 6
 2,096*
 525
 3.99
 < .0001
Department 7
 −930
 871
 −1.07
 0.2854
Department 8
 1,423*
 541
 2.63
 0.0085
Department 9
 386
 544
 0.71
 0.4774
Department 10
 −972
 533
 −1.82
 0.0685
Department 11
 6,672*
 1,721
 3.88
 0.0001
2006
 840*
 251
 3.35
 0.0008
2007
 2,036*
 220
 9.25
 < .0001
2008
 566*
 237
 2.39
 0.0169
2009
 1,324*
 222
 5.96
 < .0001
DRG index
 4,712*
 243
 19.37
 < .0001
DRG index squared
 727*
 51
 14.15
 < .0001
Age less than 50
 −40
 267
 −0.15
 0.8815
Age 50-60
 −43
 227
 −0.19
 0.8513
Age 70-80
 138
 181
 0.76
 0.4458
Age 80-90
 133
 236
 0.56
 0.5733
Age 90+
 −1,426*
 650
 −2.19
 0.0284
Woman
 −564*
 148
 −3.82
 0.0001
Daily smoker
 −106
 94
 −1.13
 0.2583
BMI information missing
 1,096*
 450
 2.44
 0.0148
Underweight
 −197
 440
 −0.45
 0.6537
Overweight
 −15
 194
 −0.08
 0.9372
Obese
 303
 261
 1.16
 0.2445
Very obese
 −1,350
 922
 −1.46
 0.1433
Diabetes
 −177
 105
 −1.68
 0.0932
Cerebral comorbidity
 −149
 83
 −1.80
 0.0716
Hypertension
 −334*
 123
 −2.71
 0.0068
Cardiac comorbidity
 25
 53
 0.46
 0.6429
Pulmonary comorbidity
 485*
 176
 2.75
 0.0060
Very acute admission
 2,365*
 553
 4.28
 < .0001
Acute admission
 1,206*
 323
 3.73
 0.0002
Elective
 790*
 301
 2.62
 0.0088
Severity information missing
 −421
 407
 −1.03
 0.3014
Moderate (ASA = 2)
 −480*
 202
 −2.37
 0.0177
Severe (ASA = 3)
 −269
 238
 −1.13
 0.2579
Very severe/fatal (ASA > 3)
 1,600*
 460
 3.48
 0.0005
Lenght of stay
 547*
 10
 53.62
 < .0001
30 days mortality
 3,893*
 422
 9.22
 < .0001
No. observations
 21,954
  
  
  
Model diagnostics (R 2 ) 0.62      

NOTE: Parameter estimates that are statistically significant at 5 per cent level have the suffix *.

Quality included as 30 days mortality.