Table 3

Logistic regression coefficients (beta) for GOLD and LLN diagnostic standard (model 8, table 2)

GOLD diagnostic standard


Age < 65 years

Age ≥ 65 years



Variable

Coefficient

95% CI

p value

Coefficient

95% CI

p value


≥1 Outpatient ICD-9 visit

1.266

1.13, 1.40

<0.001

1.394

1.24, 1.55

<0.001

≥1 Inpatient ICD-9 visit

1.262

0.77, 1.75

<0.001

0.575

0.13, 1.02

0.01

≥3 Ipratropium MDI

0.708

0.56, 0.85

<0.001

0.603

0.44, 0.76

<0.001

≥6 Albuterol MDI

0.603

0.47, 0.74

<0.001

0.454

0.29, 0.62

<0.001

Age (per decade)

0.46

0.38, 0.55

<0.001

-0.05

-0.2, 0.1

0.39

Intercept

-4.021

-4.49, -3.55

<0.001

-0.475

-1.33, 0.39

0.28


LLN diagnostic standard


Age < 65 years

Age ≥ 65 years



Variable

Coefficient

95% CI

p value

Coefficient

95% CI

p value

≥1 Outpatient ICD-9 visit

1.260

1.12, 1.40

<0.001

1.501

1.33, 1.67

<0.001

≥1 Inpatient ICD-9 visit

1.163

0.73, 1.59

<0.001

0.475

0.22, 0.84

0.01

≥3 Ipratropium MDI

0.736

0.59, 0.88

<0.001

0.662

0.59, 0.82

<0.001

≥6 Albuterol MDI

0.606

0.47, 0.74

<0.001

0.509

0.35, 0.66

<0.001

Age (per decade)

0.16

0.07, 0.2

<0.001

-0.28

-0.4, -0.2

<0.001

Intercept

-2.604

-3.03, -2.18

<0.001

0.319

-0.54, 1.18

0.47


MDI, metered dose inhaler; LLN, lower limit of normal

Cooke et al. BMC Health Services Research 2011 11:37   doi:10.1186/1472-6963-11-37

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