6.

Trial sequential analysis of time to return to activity 
 The diversity‐adjusted required information size (DARIS) was 2,354 participants based on a minimal relevant difference (MIRD) of 1 day, a variance (VAR) of 74.96, an alpha (a) of 5%, a beta (b) of 20%, and a diversity (D²) of 0%. After accruing 217 participants in two trials, only 9.2% of the DARIS has been reached. Accordingly, the trial sequential analysis program does not show the futility area. Neither the trial sequential boundaries nor the conventional statistical boundaries for benefits or harms of day‐surgery versus overnight stay were crossed by the cumulative Z‐curve (blue line).