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Table 3 Model 3 – Multivariate adjusted models, using a simplified day-of-the-week coding, adjusted for all listed variables included, and pre-admission patient characteristics (fracture type, ASA, AMTS, Pathology, Mobility) effects not shown; N (multiple imputation) = 241,446, N (complete cases) = 182,772

From: The association between the day of the week of milestones in the care pathway of patients with hip fracture and 30-day mortality: findings from a prospective national registry – The National Hip Fracture Database of England and Wales

   Multiple imputation Complete cases
Variable Level OR (95% CI) P OR (95% CI) P
Year of admission – 2011 0 1    1   
1 1.007 (0.962, 1.054) 0.77 1.084 (1.021, 1.150) 0.0083
2 0.922 (0.881, 0.965) 5.1 × 10–4 0.983 (0.928, 1.043) 0.57
3 0.795 (0.759, 0.833) 0 0.849 (0.800, 0.901) 5.5 × 10–8
Month of admission January 1    1   
February 0.976 (0.906, 1.053) 0.53 1.001 (0.914, 1.097) 0.98
March 0.899 (0.834, 0.969) 0.0052 0.923 (0.843, 1.011) 0.085
April 0.879 (0.816, 0.948) 8.3 × 10–4 0.885 (0.807, 0.969) 0.0084
May 0.797 (0.739, 0.861) 7.0 × 10–9 0.820 (0.748, 0.899) 2.5 × 10–5
June 0.758 (0.701, 0.820) 3.9 × 10–12 0.796 (0.725, 0.874) 1.7 × 10–6
July 0.753 (0.696, 0.814) 1.3 × 10–12 0.746 (0.678, 0.820) 1.2 × 10–9
August 0.792 (0.733, 0.855) 3.2 × 10–9 0.820 (0.748, 0.900) 2.7 × 10–5
September 0.844 (0.781, 0.911) 1.4 × 10–5 0.889 (0.812, 0.973) 0.011
October 0.835 (0.774, 0.900) 3.1 × 10–6 0.847 (0.774, 0.927) 3.3 × 10–4
November 0.815 (0.755, 0.879) 1.4 × 10–7 0.830 (0.758, 0.909) 5.6 × 10–5
December 0.940 (0.875, 1.011) 0.095 0.983 (0.902, 1.071) 0.69
Sunday surgery MTWTFS surgery 1    1   
Sunday surgery 1.094 (1.043, 1.148) 2.2 × 10–4 1.078 (1.018, 1.141) 0.010
Out-of-hours surgery In hours 1    1   
Out of hours 1.010 (0.941, 1.084) 0.79 1.041 (0.956, 1.134) 0.35
Time to surgery ≤ 24 hours ≤24 hours 1    1   
> 24 hours 1.094 (1.059, 1.130) 6.0 × 10–8 1.090 (1.049, 1.133) 9.3 × 10–6
  1. MTWTFS Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, OR Odds Ratio, CI Confidence Interval. Omnibus Wald test for year of admission: (CC) P < 1.0 × 10–16; (MI) P < 1.0 × 10–16. Omnibus Wald test for month of admission (CC) P < 3.4 × 10–14; (MI) P < 1.0 × 10–16