Fig. 6

The funnel plot. a funnel chart shows that the distribution of each study is roughly symmetrical

the effect OR is plotted on the abscissa, while the reciprocal 1/SE (log OR) of the standard error of the effect is plotted on the ordinate. The dotted lines perpendicular to the horizontal axis represent the combined effect, and the dotted lines on both sides of the chart represent the 95% confidence interval

Acronym:

(Dex): dexmedetomidine; (Mid): midazolam; (N): saline; (Pro): propofol; (Sev): sevoflurane;

A:(Dex):dexmedetomidine; B:(Mid):midazolam; C:(N):saline; D:P(Pro):propofol; E(Sev):sevoflurane;