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

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