Table 3.

Predictors of correct interpretation of valid spirometry traces carried out in primary care (n=222)

Characteristics	Crude OR (95% CI)	Adjusted OR (95% CI)*
Age (per year)	0.98 (0.96–1.01)	0.98 (0.96–1.01)
Female sex	1.26 (0.69–2.30)	1.28 (0.69–2.38)
Previous GP diagnosis of asthma	0.50 (0.27–0.94)	0.49 (0.26–0.93)
Spirometry conducted post-bronchodilator**	0.62 (0.20–2.03)	0.61 (0.18–2.09)

Notes:

^*Adjusted for other characteristics in the table.

^**Reference category is spirometry conducted pre-bronchodilator. Excluding traces where it was unclear if spirometry was conducted pre- or post-bronchodilator.

Abbreviations: OR, odds ratio; CI, confidence interval; GP, general practitioner.