| Group M1 (n = 20) | Group M2 (n = 20) | Group M3 (n = 20) | Group M4 (n = 20) | P value |
---|---|---|---|---|---|
Age (yr) | 33.7 ± 5.3 | 34.3 ± 4.1 | 31.6 ± 4.0 | 32.8 ± 3.7 | 0.24 |
Weight (kg) | 67.0 ± 6.7 | 66.6 ± 8.4 | 65.2 ± 7.1 | 67.0 ± 6.5 | 0.83 |
Height (cm) | 161.0 ± 3.3 | 159.6 ± 5.2 | 158.7 ± 3.9 | 161.9 ± 4.7 | 0.09 |
BMI(kg m−2) | 25.9 ± 2.5 | 26.1 ± 2.5 | 25.9 ± 2.5 | 25.4 ± 2.4 | 0.83 |
GA(wk) | 38 (37 ~ 40) | 38 (36 ~ 40) | 38 (37 ~ 40) | 38 (36 ~ 40) | 0.62 |
Sensory block level (dermatome) | T4(T4 ~ 6) | T5(T4 ~ 6) | T4(T4 ~ 6) | T5(T4 ~ 6) | 0.67 |
I-D interval(min) | 13.7 ± 3.6 | 13.7 ± 2.8 | 12.1 ± 2.9 | 12.6 ± 2.7 | 0.26 |
U-D interval(s) | 64.8 ± 11.5 | 61.9 ± 16.0 | 62.8 ± 20.7 | 64.5 ± 16.4 | 0.94 |