Table 3 Table showing results of univariate and multivariate logistic regression of the factors that influence 30-day mortality in the elderly.

From: Preoperative Red Cell Distribution Width and 30-day mortality in older patients undergoing non-cardiac surgery: a retrospective cohort observational study

  

N

Unadjusted OR (95% CI)

P value

Adjusted OR (95% CI)

P value

Patient characteristics

Age

65 to 69 years

9201

REF

 

REF

 

70–75 years

7938

1.81 (1.30–2.50)

<0.001

1.25 (0.78–2.00)

0.348

>=76 years

7440

4.10 (3.07–5.49)

<0.001

2.41 (1.61–3.63)

<0.001

Gender

Male

11671

REF

 

REF

 

Female

12908

0.67 (0.54–0.82)

<0.001

0.94 (0.69–1.27)

0.67

Race

Chinese

20965

REF

 

REF

 

Malay

1272

2.42 (1.73–3.41)

<0.001

1.88 (1.17–3.02)

0.01

Indian

1121

1.25 (0.77–2.02)

0.36

1.26 (0.66–2.43)

0.48

Others

1221

1.34 (0.86–2.10)

0.20

0.99 (0.45–2.20)

0.98

Operation details

Priority of Operation

Elective

20032

REF

 

REF

 

Emergency

4547

9.61 (7.66–12.05)

<0.001

2.99 (2.15–4.14)

<0.001

Surgical Risk

Low

9728

REF

 

REF

 

Moderate

13305

1.49 (1.17–1.91)

0.001

1.87 (1.28–2.71)

0.001

High

1546

3.84 (2.76–5.35)

<0.001

1.38 (0.81–2.37)

0.24

Type of Anaesthesia

GA

17355

REF

 

REF

 

RA

7224

0.68 (0.53–0.88)

0.003

0.72 (0.50–1.04)

0.08

Repeat Operations within 30 days

 

1496

3.59 (2.72–4.73)

<0.001

2.29 (1.51–3.45)

<0.001

Perioperative Packed Red Blood Cell Transfusion

0 unit

22294

REF

 

REF

 

1 unit

1812

5.74 (4.46–7.37)

<0.001

1.72 (1.15–2.58)

0.009

2 or more units

473

12.67 (9.17–17.52)

<0.001

2.50 (1.51–4.14)

<0.001

Patient characteristics

ASA-PS

1&2

16155

REF

 

REF

 

3

6974

8.69 (6.19–12.18)

<0.001

2.79 (1.76–4.43)

<0.001

4&5

532

82.50 (56.87–119.68)

<0.001

10.07 (5.78–17.55)

<0.001

RDW

1st quartile

RDW≤12.8%

6540

REF

 

REF

 

2nd quartile

RDW>12.8% and≤13.4%

6025

1.91 (1.10–3.30)

0.02

1.31 (0.65–2.64)

0.45

3rd quartile

RDW>13.4% and≤14.3%

5286

4.63 (2.28–7.60)

<0.001

2.12 (1.13–3.99)

0.02

4th quartile

RDW>14.3%

5823

12.20 (7.70–19.32)

<0.001

2.85 (1.57–5.17)

0.001

Preoperative Anaemia

None

14628

REF

 

REF

 

Mild

5171

3.20 (2.30–4.47)

<0.001

1.44 (0.90–2.29)

0.13

Moderate/Severe

4391

10.58 (8.00–14.01)

<0.001

1.61 (1.03–2.53)

0.04

Presence of individual components of RCRI

Ischemic heart disease

2712

4.32 (3.29–5.68)

<0.001

1.70 (1.22–2.36)

0.002

Previous Cerebrovascular accident

1056

2.91 (1.99–4.23)

<0.001

1.19 (0.76–1.85)

0.45

Diabetes mellitus on insulin

858

2.92 (1.94–4.40)

<0.001

0.82 (0.50–1.36)

0.44

Congestive cardiac failure

500

4.58 (2.97–7.06)

<0.001

1.09 (0.66–1.81)

0.73

Stage of kidney disease based on eGFR (mL/min/1.73 m2)

None or 1

8608

REF

 

REF

 

2

9943

0.79 (0.57–1.09)

0.15

0.69 (0.44–1.09)

0.11

3

3558

2.48 (1.80–3.42)

<0.001

1.07 (0.68–1.67)

0.78

4–5

1582

8.97 (6.68–12.03)

<0.001

2.00 (1.29–3.10)

0.002

  1. Legend ASA-PS = American Society of Anaesthesiologists Physical Status; eGFR = estimated Glomerular Filtration Rate; GA = general anaesthesia; IQR = interquartile range; OR = odds ratio; RDW = Red Cell Distribution Width; REF = reference; RA = regional anaesthesia; RCRI = Revised Cardiac Risk Index.
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