Irizar Aramburu 2013.

Study characteristics
Methods	Design: Randomized controlled trial Setting: Primary care practices in Gipuzkoa, Spain Recruitment: Randomly selected from electronic medical record
Participants	335 adults who smoked, 52% F, av.age 53.6, av. cpd not reported
Interventions	Intervention: participants received a spirometry test delivered by a nurse and the same brief anti‐smoking intervention as the control group Participant also received a short explanation of the spirometry results Control: participants received brief anti‐smoking intervention
Outcomes	7‐day PPA at 12m Validation: Expired CO < 10 ppm
Funding Source	International Centre of Research Excellence in Chronicity, Kronikgune and the Department of Health of the Basque Government
Author's declarations of interest	Authors declared that they had no conflict of interest
Notes	Strategy: Spirometry Level: Patient Comparison type: Single component Some information obtained from study author
Risk of bias
Bias	Authors' judgement	Support for judgement
Sequence Generation	Low risk	The randomization sequence was generated by computer and kept in the research unit
Allocation concealment	Unclear risk	No details reported
Blinding of outcome assessors All outcomes	Low risk	Smoking status was validated by carbon monoxide
Incomplete outcome data All outcomes	Unclear risk	No details reported