I am doing critical appraisal of a paper. The study has missing covariate data. The missing data is listed but it does not state what categories the data is missing? Is it appropriate to impute missing covariate data or was the study correct in just listing the amount missing and continuing with analysis.
Independent variable (self-reported sleep duration) Dependent variable (Hypertension) Missing covariates include alcohol consumption, caffeine, smoking, CVD, insomnia symptoms, depressive symptoms.