Table 2 Demographic data for all participants
|  | EA group (N = 21) | RT group (N = 21) | t | χ2 | P |
|---|---|---|---|---|---|
Age (years), mean ± SD | 56.0 ± 11.31 | 56.8 ± 12.16 | 0.221 |  | 0.826 |
Gender (F),  % | 23.8% | 23.8% | – | 0.130 | 0.641 |
Race (Han),  % | 90.5% | 85.7% | – | 0.000 | 0.500 |
Married,  % | 95.2% | 100% | – | 0.000 | 0.235 |
Retirement,  % | 23.8% | 23.8% | – | 0.000 | 0.280 |
Illiteracy/yes,  % | 4.8% | 19.0% | – | 0.980 | 0.472 |
Weight (kg), mean ± SD | 65.6 ± 2.56 | 64.7 ± 1.16 | 1.467 | – | 0.150 |
Anesthesia time (h), mean ± SD | 4.03 ± 0.35 | 4.19 ± 0.38 | 1.419 | – | 0.164 |
Surgery duration (h), mean ± SD | 3.52 ± 0.28 | 3.43 ± 0.31 | 0.987 | – | 0.329 |
Opioids’ dosage (g), mean ± SD | 0.86 ± 0.48 | 0.67 ± 0.66 | 1.067 | – | 0.292 |