Table 2

Percentage of inappropriate stays and associated factors: bivariate and multivariate analysis.



Rate of inappropriateness
 Bivariate analysis
 Multivariate analysis





n
 %
 95CI-LL*
 95CI-UL*
 RR*
 95CI-LL*
 95CI-UL*
 p
 ROR*
 95CI-LL*
 95CI-UL*
 p
Age
 < 45 years†
 257
 29.2
 23.6
 34.7








45–65 years
 968
 50.3
 47.2
 53.5
 1.72
 1.35
 2.20
 <0.0001‡
 1.98
 1.40
 2.81
 0.0001‡

> 65 years
 1359
 44.6
 41.9
 47.2
 1.53
 1.20
 1.94
 0.0006‡
 1.97
 1.38
 2.81
 0.0002‡
Sex
 Male†
 1708
 46.1
 43.8
 48.5








Female
 876
 43.4
 40.1
 46.7
 0.94
 0.08
 1.03
 0.1966
 1.05
 0.86
 1.29
 0.6195
Admission
 Urgent†
 1183
 37.0
 34.3
 39.8








Programmed
 1401
 52.1
 49.5
 54.7
 1.40
 1.28
 1.53
 <0.0001‡
 2.58
 2.09
 3.20
 <0.0001‡
Hospitalization length
 < 7 days†
 1000
 27.3
 24.5
 30.1








≥ 7 days
 1584
 56.5
 54.1
 58.9
 2.07
 1.85
 2.31
 <0.0001‡
 4.13
 3.29
 5.18
 <0.0001‡
Correctly documented medical records
 Yes†
 649
 35.0
 31.3
 38.6








No
 1932
 48.7
 46.5
 50.9
 1.39
 1.24
 1.56
 <0.0001‡
 2.01
 1.59
 2.55
 <0.0001‡
Correctly documented nursing records
 Yes†
 2474
 45.1
 43.1
 47.0








No
 107
 49.5
 40.1
 59.0
 1.10
 0.90
 1.34
 0.4185
 1.21
 0.78
 1.88
 0.3952
Working day
 Yes†
 1971
 41.5
 39.3
 43.7








No
 613
 57.1
 53.2
 61.0
 1.38
 1.23
 1.50
 <0.0001‡
 1.91
 1.56
 2.34
 <0.0001‡
Service
 Angiology and Vascular Surgery
 592
 51.7
 47.6
 55.8
 1.96
 1.54
 2.49
 <0.0001‡
 1.25
 0.95
 1.65
 0,1055

Heart Surgery
 221
 59.7
 53.0
 66.4
 2.71
 1.99
 3.70
 <0.0001‡
 1.75
 1.25
 2.45
 0.0010‡

General Surgery 'Service A'
 358
 64.3
 58.3
 70.4
 1.58
 1.21
 2.07
 0.0008‡
 1.91
 1.44
 2.53
 <0.0001‡

General Surgery 'Service B'
 219
 40.6
 33.9
 47.4
 1.25
 0.92
 1.71
 0.1580
 1.07
 0.76
 1.51
 0.7101

Laparoscopic Surgery
 103
 32.0
 22.5
 41.5
 0.86
 0.56
 1.32
 0.4903
 0.78
 0.49
 1.22
 0.2743

Thoracic Surgery
 322
 68.9
 63.7
 74.2
 4.06
 3.04
 5.41
 <0.0001‡
 2.52
 1.83
 3.49
 <0.0001‡

Gynaecology
 34
 2.9
 0.1
 15.3
 0.06
 0.01
 0.34
 0.0019‡
 0.10
 0.02
 0.65
 0.0155‡

Neurosurgery
 61
 36.1
 23.2
 48.9
 1.03
 0.62
 1.72
 0.9072
 1.58
 0.92
 2.71
 0.0995

Ophthalmology
 72
 31.9
 20.5
 43.4
 0.86
 0.53
 1.40
 0.5404
 0.86
 0.51
 1.43
 0.5580

Otorhinolaryngology
 129
 51.2
 42.1
 60.2
 1.91
 1.32
 2.77
 0.0005‡
 0.95
 0.64
 1.43
 0.8214

Traumatology
 252
 23.4
 18.0
 28.8
 0.56
 0.40
 0.78
 0.0005‡
 1.05
 0.74
 1.49
 0.7858

Urology
 221
 22.2
 16.5
 27.9
 0.52
 0.37
 0.74
 0.0002‡
 0.82
 0.56
 1.20
 0.3052
TOTAL
2584
 45.2
 43.3
 47.1







* 95CI: 95% confidence interval; LL: lower limit; UL: upper limit; RR: relative risk; ROR: risk odds ratio. † reference category. For variable 'Service' the reference is the mean effect. ‡ statistically significant for p < 0.05.

Tamames et al. BMC Health Services Research 2007 7:187   doi:10.1186/1472-6963-7-187