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Table 5 Multiple linear regression models

From: Value of serum and induced sputum surfactant protein-D in chronic obstructive pulmonary disease

Multiple linear regression model for six month exacerbation frequency by serum and induced sputum SP-D levels

 

Coefficient B

Standard error

t

p

Constant

−0.37

0.32

−1.15

0.25

Serum SP-D levels

0.008

0.002

4.22

0.0001

Sputum SP-D levels

0.011

0.009

1.18

0.247

Multiple linear regression model for induced sputum SP-D levels by six month exacerbation frequency and number of years on inhaled steroid treatment.

 

Coefficient B

Standard Error

t

p

Constant

16.948

3.78

4.4

0.0001

Six month exacerbation frequency

1.38

2.14

0.64

0.525

Number of years on inhaled steroid treatment

2.848

0.53

5.37

0.0001

Multiple linear regression model for serum SP-D levels by age, FEV1 (%) and six month exacerbation frequency

 

Coefficient B

Standard error

t

p

Constant

17.660

70.64

0.25

0.80

Age

1.461

1.08

1.35

0.187

FEV1(%)

−0.61

0.45

−1.36

0.182

Six month exacerbation frequency

42.598

9.85

4.32

0.0001

  1. FEV 1 forced expiratory volume, SP-D surfactant protein D.