Table 3 Effects of the de-implementation strategy, measurement, and covariates on the outcome “use of blood salvage”

Intervention group, relative to control group

1.7

0.3 to 11.4

0.57

Time effect, effect measurement relative baseline

0.1

0.02 to 0.3

<0.001

Joint, knee relative to hip

4.6

3.7 to 5.7

<0.001

Sex, female relative to male

0.8

0.6 to 1.0

0.042

• ASA 2

1.1

0.8 to 1.4

0.62

• ASA 3–4

0.8

0.5 to 1.2

0.23

BMI

1.0

1.0 to 1.0

0.27

Preoperative Hb

1.0

0.9 to 1.1

0.30

Age

1.0

1.0 to 1.0

0.58