Table 3 Association between practice characteristics and spirometry testing in partnership practices

Training practice

No

1

1

Yes

0.95 (0.84–1.08)

0.91 (0.79–1.04)

Mean age of doctors (years)

≤ 45

1

1

45–49

0.72 (0.50–1.03)

0.66 (0.45–0.97)*

50–54

0.68 (0.47–0.98)*

0.61 (0.42–0.89)*

55–59

0.54 (0.34–0.86)*

0.45 (0.29–0.71)*

60–64

0.52 (0.31–0.86)*

0.43 (0.26–0.72)*

≥65

0.39 (0.17–0.90)*

0.25 (0.10–0.61)*

Number of doctors

2

1

1

3

0.97 (0.84–1.13)

0.99 (0.77–1.27)

4

1.17 (0.95–1.45)

1.15 (0.90–1.45)

5

1.03 (0.82–1.30)

1.08 (0.77–1.51)

>5

1.05 (0.76–1.37)

1.03 (0.69–1.53)

Number of patients per doctor

<1347

1

1

1347–1575

0.96 (0.82–1.12)

0.97 (0.82–1.15)

1576–1756

1.12 (0.94–1.34)

1.16 (0.96–1.34)

>1756

0.86 (0.69–1.07)

0.88 (0.70–1.11)

Gender of doctors

Male

1

1

Predominantly male

1.05 (0.87–1.27)

0.99 (0.77–1.27)

Equal male/female

1.07 (0.89–1.29)

1.04 (0.85–1.28)

Predominantly female

1.05 (0.84–1.32)

0.94 (0.73–1.26)

Female

1.07 (0.81–1.42)

1.04 (0.76–1.42)