Data collection Baseline data such as age, sex, weight, smoking history, comorbidities, American Society of Anesthesiologists (ASA)-classification, peripheral oxygen saturation (SpO2) and results from a spirometry measurement will be collected during the meeting with the anesthesiologist at the outpatient clinic two weeks prior to surgery. Treatment- and patient care data such as need for analgesics, blood pressure, heart rate, and respiratory rate will continually be registered in a bedside case report form. Time for, duration of and frequency of mobilization will also be registered in the study protocol. Finally, information of any deaths, respiratory complications such as pneumonia, patients' length of stay at the recovery unit and at the hospital will be obtained from medical charts.