Comparison 2. Chloral hydrate (CH).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Overall behaviour (ordinal scale, Houpt or similar)	5		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.1 CH vs CH/hydroxyzine	1		Mean Difference (IV, Fixed, 95% CI)	0.0 [0.0, 0.0]
1.2 CH/hydroxyzine vs triazolam	1		Mean Difference (IV, Fixed, 95% CI)	0.0 [0.0, 0.0]
1.3 CH/hydroxyzine vs midazolam/acetaminophen	1		Mean Difference (IV, Fixed, 95% CI)	0.0 [0.0, 0.0]
1.4 CH/promethazine vs meperidine/promethazine	1		Mean Difference (IV, Fixed, 95% CI)	0.0 [0.0, 0.0]
1.5 CH/hydroxyzine vs CH/hydroxyzine/midazolam	1		Mean Difference (IV, Fixed, 95% CI)	0.0 [0.0, 0.0]
2 Good or better behaviour	1		Risk Ratio (M‐H, Fixed, 95% CI)	Subtotals only
2.1 CH vs CH/hydroxyzine	1	20	Risk Ratio (M‐H, Fixed, 95% CI)	0.57 [0.24, 1.35]