Demographics, comorbidities, intraoperative and postoperative data for 120 particpants from the SNaPP Pilot Study. Male and female participants aged 40 years and over and presenting for abdominal or thoracic surgery under relaxant general anaesthesia. Assessed at hospital discharge, or after 7 days if still in hospital, for the primary outcome (postoperative pulmonary complications); at 30 days for days alive and at home and at 3 months for quality of life.