Table 3 Multivariable regression analysis results for the effect of anaesthetic type (general anaesthetic vs. spinal anaesthetic) on outcome following surgery for hip fracture patients in England, Wales and Northern Ireland during 2018-19, as recorded in the National Hip Fracture Database

Delirium assessment (categorical)

0.96

0.94–0.99

0.007

Delirium alertness

0.90

0.86–0.96

<0.001

Delirium AMT4 1 vs 0

1.00

0.95–1.04

0.859

Delirium AMT4 2 vs 0

0.89

0.85–0.93

<0.001

Delirium attention

1.00

0.97–1.03

0.969

Delirium acute change

0.99

0.94–1.03

0.496

Mobilised on day of or day following surgery

1.02

0.99–1.06

0.156

Length of hospital stay

Linear regression coefficient = −0.46

−0.66 to −0.26

<0.001

Returned to admission source

1.04

1.01–1.06

0.013

Life status at 30 days

1.03

0.98–1.09

0.248