Table 2.

Postoperative results

	Group I (n = 18)	Group II (n = 19)	Group III (n = 19)	Group IV (n = 20)	Group C (n = 19)
First analgesic requirement (min)	38.6 ± 19.5*	42.2 ± 18.9*	62.7 ± 21.3†‡	60.6 ± 21†‡	27.3 ± 18.3
PCA demands (n)	16.3 ± 7.8†	15.8 ± 7.2†	12.3 ± 7.4†	13.2 ± 6.9†	37.3 ± 11.6
PCA boluses (n)	8.6 ± 3.2†	7.7 ± 3.3†	6.1 ± 2.7†	6.3 ± 2.6†	14.6 ± 5.3
Total morphine consumption at 24 h (mg)	16.8 ± 4.3†	15.1 ± 4.1†	11.7 ± 3.7†	12.1 ± 3.9†	27.6 ± 6.2
Hospital stay (h)	19.6 ± 2.8†	20.4 ± 2.4†	18.7 ± 2.2†	18.6 ± 1.9†	25.7 ± 2.1

Data are given as mean ± SD

* P < 0.05, compared with Group C

† P < 0.001, compared with Group C

‡ P < 0.01, compared with Groups I and II

PCA patient-controlled analgesia