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Power and type I error probability (α) for fixed effects analysis, with 10%, 25%, and 40% missingness. The target significance level is 0.05. NM is no missingness, MI is multiple imputation using gamma meta-regression, ME is mean imputation, SGR is single imputation using gamma meta-regression, SLM is single imputation using linear regression based on the log-variance, and CC is complete case analysis.
