Table 4 Pooled risk of baseline laboratory data and surgical characteristics of pneumonia following hip fracture surgery

Hemoglobin

5

−0.14^a

−0.25

−0.03

0.01

46

Fixed

Albumin

4

−0.97^a

−1.54

−0.41

< 0.01

95

Random

Blood urea nitrogen

3

0.20^a

0.03

0.37

0.02

35

Fixed

Creatinine

5

0.22^a

−0.01

0.46

0.06

76

Random

Aspartate aminotransferase

3

0.00^a

−0.17

0.17

0.99

27

Fixed

Alanine aminotransferase

3

0.27^a

0.10

0.44

< 0.01

0

Fixed

Total bilirubin

2

−0.05^a

−0.24

0.14

0.62

0

Fixed

Arterial O₂ pressure

2

−0.49^a

−0.71

− 0.27

< 0.01

0

Fixed

Arterial CO₂ pressure

2

0.04^a

−0.18

0.26

0.70

9

Fixed

Intertrochanteric fracture

3

0.90

0.64

1.27

0.55

0

Fixed

Arthroplasty

7

1.24

0.78

1.97

0.35

64

Random

Delayed surgery of over 48 h

3

3.74

2.40

5.85

< 0.01

0

Fixed

Time from injury to surgery

4

0.39^a

−0.02

0.79

0.06

94

Random

General anesthesia

5

0.99

0.76

1.30

0.95

44

Fixed

Surgical duration

5

−0.01^a

−0.11

0.10

0.91

0

Fixed

Intraoperative blood loss volume

3

−0.01^a

− 0.17

0.15

0.90

0

Fixed

Perioperative transfusion rate

2

0.98

0.68

1.40

0.91

0

Fixed