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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.
