Table 4.

Comparison of PCA use in children in the four groups ($\overline{x}$ ± s).

Group	48 h compressions	48 h total sufentanil (gg/kg)
Group A	13.7 ± 3.6	2.53 ± 0.14
Group B	8.4 ± 2.6*	2.27 ± 0.11
Group C	2.4 ± 0.4*	2.08 ± 0.02*
Group D	0.3 ± 0.1*	1.96 ± 0.01*

^*P < 0.05 compared to Group A.