sleep.length

#Sleep Length
sub.sleep.hour=metagen(TE,
                     SeTE,
                     data = Subjective_Sleep_length,
                     studlab = paste(Author),
                     comb.fixed = FALSE,
                     comb.random = TRUE,
                     method.tau = "SJ",
                     hakn = TRUE,
                     prediction = TRUE,
                     sm = "SMD")
sub.sleep.hour

type.sub=update.meta(sub.sleep.hour, 
                     byvar=type, 
                     comb.random = TRUE, 
                     comb.fixed = FALSE)
type.sub

forest(type.sub,
       layout = "RevMan5",
       digits.sd = 2)