From: Influences of comorbidities on perioperative rehabilitation in patients with gastrointestinal cancers: a retrospective study
Level 1
Therapeutic (in-bed) exercises
Level 2
Bed mobility (supine to sit)
Level 3
Transfer training (sit to stand/bed to chair)
Level 4
Gait training (walk with assistance)
Level 5
Gait training (walk independently)