Table 2 Balance of mean standardised mean differences (SMD) for selected variables before and after propensity score matching.

From: Impact of statins on short and long term mortality in severe community acquired pneumonia in the intensive care unit

Characteristic

Unmatched cohort

Matched cohort

No statin, (n = 3,469)

Statin,

(n = 1,273)

Standardised differences

p-value

No statin, (n = 3,059)

Statin, (n = 1,203)

Standardised differences

p-value

Age

64.40

71.05

0.452

< 0.001

71.30

71.01

−2.0

0.593

Charlson Comorbidity Index

5.31

6.73

0.502

< 0.001

6.68

6.71

0.9

0.826

Generalised Malignancy

0.17

0.14

−0.110

0.002

0.13

0.13

1.6

0.674

Immunosuppression

0.08

0.05

−0.130

< 0.001

0.05

0.05

1.0

0.781

Chronic Kidney Disease

0.17

0.30

0.307

< 0.001

0.29

0.28

2.5

0.591

Transplanted

0.01

0.02

−0.046

0.198

0.01

0.01

−6.5

0.126

Autoimmune Disease

0.03

0.02

−0.027

0.427

0.02

0.02

0.5

0.893

SAPS II

38.22

40.37

0.159

< 0.001

40.4

40.3

−1.0

0.805

SOFA

5.03

5.11

0.022

0.518

5.20

5.11

−2.7

0.499

Creatinine at day 1

1.47

1.78

0.198

< 0.001

1.71

1.77

4.3

0.345

GCS on day 1

13.62

13.71

0.034

0.315

13.71

13.71

0.1

0.974

Temperature

36.9

36.8

−0.063

0.065

36.89

36.87

−4.4

0.282

Viral Pneumonia

0.04

0.04

0.020

0.561

0.05

0.04

−6.7

0.134

ARDS

0.49

0.51

0.036

0.288

0.48

0.50

4.0

0.328

  1. Abbreviations: Simplified Acute Physiology Score II (SAPS II), Sequential Organ Failure Assessment score (SOFA), Glasgow Coma Scale (GCS), Acute Respiratory Distress Syndrome (ARDS).
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