Stepwise sedation for elderly patients with mild/moderate COPD during upper gastrointestinal endoscopy

Figure 2 Recovery times of patients in the four groups. Group Cs: Chronic obstructive pulmonary disease (COPD) with stepwise sedation; Group Cc: COPD with continuous sedation; Group Ns: Non-COPD with stepwise sedation; Group Nc: Non-COPD with continuous sedation. ^bP < 0.01 between Group Cs vs Group Cc and Group Ns vs Group Nc.