Table 1 Demographic and clinical characteristics based on the success rates of the spinal insertion
Variables | Success at | P – value | |
|---|---|---|---|
First attempt (n = 38) | Not at first attempt (n = 10) | ||
Race, n (%) | 0.1630 | ||
Chinese | 15 (39.5) | 1 (10.0) | – |
Malay | 11 (28.9) | 6 (60.0) | – |
Indian | 8 (21.1) | 3 (30.0) | – |
Others | 4 (10.5) | 0 (0.0) | – |
Age (years), mean ± SD | 32.3 ± 4.9 | 32.0 ± 4.6 | 0.9493 |
Weight (kg), mean ± SD | 88.5 ± 15.3 | 88.1 ± 9.1 | 0.7128 |
BMI (kg/m2), mean ± SD | 35.0 ± 4.8 | 34.9 ± 3.4 | 0.6476 |
Level of scan operator Consultant, n (%) | 38/38 (100) | 10/10 (100) | – |
Skin to posterior complex depth (mm), mean (SD) | 43.7 ± 4.7 | 45.2 ± 3.6 | 0.1922 |
Use of ‘Obese’ Mode, n (%) | 7/38 (18.4) | 3/10 (30.0) | 0.4143 |
Midline scanning duration (secs), median [IQR] | 21.0 [16.0, 29.0] | 25.0 [18.0, 37.0] | 0.4847 |
Transverse scanning duration (secs), median [IQR] | 11.0 [5.0, 21.0] | 9.0 [5.0, 22.0] | 0.8758 |