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Table 2 Percentage of inappropriate stays and associated factors: bivariate and multivariate analysis.

From: Factors associated with the appropriate use of preoperatory hospital stays: historical cohort study

    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         
  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.