Table 4. The PCA button pushed and rescue tramadol required.

	Group S (n=47)	Group D (n=46)	P Value
Button pushed on 2h, n (%)
0/≥1/≥3	25(53.2%)/21(44.7%)/1(2.1%)	26(56.5%)/19(41.3%)/1(2.2%)	0.916
Button pushed on 8h, n (%)
0/≥1/≥3	24(51.1%)/19(40.4%)/4(8.5%)	24(52.2%)/17(37.0%)/5(10.9%)	0.911
Button pushed on 12h, n (%)
0/≥1/≥3	30(63.8%)/14(29.8%)/3(6.4%)	33(71.7%)/12(26.1%)/1(2.2%)	0.533
Button pushed on POD 1, n (%)
0/≥1/≥3	30(63.8%)/13(27.7%)/4(8.5%)	31(67.4%)/10(21.7%)/5(10.9%)	0.808
Button pushed on POD 2, n (%)
0/≥1/≥3	33(70.2%)/10(21.3%)/4(8.5%)	34(73.9%)/10(21.7%)/2(4.3%)	0.821
Rescue tramadol on 2h, n (%)
0/≥1/≥2	32(68.1%)/12(25.5%)/3(6.4%)	33(71.7%)/12(26.1%)/1(2.2%)	0.750
Rescue tramadol on 8h, n (%)
0/≥1/≥2	32(68.1%)/13(27.7%)/2(4.3%)	30(65.2%)/14(30.4%)/2(4.3%)	0.931
Rescue tramadol on 12h, n (%)
0/≥1/≥2	37(78.7%)/9(19.1%)/1(2.1%)	37(80.4%)/7(15.2%)/2(4.3%)	0.836
Rescue tramadol on POD 1, n (%)
0/≥1/≥2	38(80.9%)/7(14.9%)/2(4.3%)	33(71.7%)/10(21.7%)/3(6.5%)	0.586
Rescue tramadol on POD 2, n (%)
0/≥1/≥2	44(93.6%)/3(6.4%)/0(0.0%)	42(91.3%)/3(6.5%)/1(2.2%)	0.837
Rescue tramadol on POD 3, n (%)
0/≥1	44(93.6%)/3(6.4%)	43(93.5%)/3(6.5%)	1.000
Rescue tramadol on POD 5, n (%)
0/≥1	44(93.6%)/3(6.4%)	44(95.7%)/2(4.3%)	1.000
Rescue tramadol on POD 7, n (%)
0/≥1	46(97.9%)/1(2.1%)	44(95.7%)/2(4.3%)	0.617

Notes: Data are number of patients (%).