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Table 1 Results of uni- and multi-variate regression analyses of factors associated with failure to have an admission MRSA swab performed 1

From: Methicillin-resistant Staphylococcus aureus risk profiling: who are we missing?

  Proportions (n) Univariate regression Multivariate regression
Variable Swabs missed (n = 267) Swabs done (n = 1740) OR [95%CI] P value Adjusted OR [95%CI] P value
Male sex 55.9 (148) 58.6 (997) 0.9 [0.7-1.1] 0.402   
Age < 50 years old 30.3 (81) 19.9 (339) 1.7 [1.3-2.3] <0.001 2.4 [1.4-3.9] <0.001
Admitted from ICU 4.5(12) 7.6(129) 0.6 [0.3-1.1] 0.074   
Admitted from another ward 7.1(19) 2.7(45) 2.8 [1.6-4.9] <0.001 2.8 [1.1-7.1] 0.028
Admitted from home 88.3(235) 89.7(1526) 0.9 [0.6-1.3] 0.484   
Uncomplicated diabetes mellitus 10.4(12 18.7(126) 0.5 [0.3-0.9] 0.034   
Acute renal failure 10.4(12 21.8(147) 0.4 [0.2-0.8] 0.006   
Chronic renal failure 6.1(7) 13.8(93) 0.4 [0.2-0.9] 0.026   
End stage renal failure 4.3(5) 2.4(16) 1.9 [0.7-5.2] 0.231   
Complicated diabetes mellitus 5.2(6) 9.8(66) 0.5 [0.2-1.2] 0.122   
Peripheral vascular disease 2.6(3) 4.3(29) 0.6 [0.2-2.0] 0.400   
Chronic obstructive pulmonary disease 9.6(11) 14.4(97) 0.6 [0.3-1.2] 0.167   
Dementia 0.9(1) 1.5(10) 0.6 [0.07-4.6] 0.608   
Stroke 0 0.9(6) Omitted    
Cerebral haemorrhage 1.0(1) 0.4(3) 2.0 [0.2-19.0] 0.561   
Congestive cardiac failure 11.3(13) 24.8(167) 0.4 [0.2-0.7] 0.002   
Ischaemic heart disease 10.4(12) 11.3(76) 0.9 [0.5-1.8] 0.791   
Haematological malignancy 10.4(12) 5.8(39) 1.9 [1.0-3.7] 0.065   
Carotid artery stenosis 0 1.2(8) Omitted    
Parkinsons disease 0.9(1) 0.7(5) 1.2 [0.1-10.2] 0.884   
Connective tissue disease 0.9(1) 2.2(15) 0.4 [0.05-2.9] 0.358   
Liver failure 1.0(1) 1.8(12) 0.5 [0.06-3.8] 0.488   
Respiratory failure 0 1.0(7) Omitted    
Solid organ cancer 35.7(41) 15.4(104) 3.0 [1.9-4.7] <0.001 3.2[2.1-5.1] <0.001
Metastatic cancer 12.6(13) 7.3(50) 1.8 [0.3-3.9] 0.866 2.6 [1.4-4.8] 0.004
Peptic ulcer disease 1.9(2) 2.5(17) 1.1 [0.3-3.9] 0.866   
Infection 1.9(2) 0.7(5) 2.4 [0.5-12.5] 0.301   
Day of the week       
Monday 8.90(35) 91.10(358) 0.8[0.4-1.4] 0.355   
Tuesday 16.02(62) 83.98(325) 1.5[0.9-2.5] 0.140   
Wednesday 15.93(54) 84.07(285) 1.5[0.9-2.5] 0.155   
Thursday 16.08(46) 83.92(240) 1.5[0.9-2.6] 0.153   
Friday 15.49(35) 84.51(191) 1.4[0.8-2.6] 0.226   
Saturday 8.61(13) 91.39(138) 0.7[0.4-1.5] 0.408   
Sunday 11.35(21) 88.65(164) 0.8[0.5-1.3] 0.365   
  1. 1. Denominators used to calculate proportions were adjusted for the number of patients in whom data were available. OR odds ratio, CI confidence interval.