Table 4 Propensity score matching between the old and new catheter groups
Unadjusted values | After propensity score matching | ||||||
|---|---|---|---|---|---|---|---|
Old group | New group | P-value | Old group | New group | P-value | SMD | |
(n = 354) | (n = 181) | (n = 181) | (n = 181) | ||||
Age (years) | 55.9 (15.9) | 56.6 (15.5) | 0.658 | 56.7 (15.8) | 56.6 (15.5) | 0.941 | 0.008 |
Sex (male) | 101 (28.5%) | 49 (27.1%) | 0.761 | 45 (24.9%) | 49 (27.1%) | 0.719 | 0.050 |
Height (cm) | 158.9 (8.5) | 159.5 (7.7) | 0.355 | 158.9 (8.1) | 159.5 (7.7) | 0.422 | 0.085 |
Weight (kg) | 58.5 (11.9) | 59.6 (12.3) | 0.326 | 59.5 (12.8) | 59.6 (12.3) | 0.920 | 0.011 |
BMI (kg/m2) | 23.2 (3.9) | 23.4 (4.0) | 0.546 | 23.6 (4.3) | 23.4 (4.0) | 0.753 | 0.033 |
ASA-PS | |||||||
1 | 98 (27.7%) | 40 (22.1%) | 0.238 | 36 (19.9%) | 40 (22.1%) | 0.880 | 0.055 |
2 | 212 (59.9%) | 122 (67.4%) | 126 (69.6%) | 122 (67.4%) | |||
3 | 44 (12.4%) | 19 (10.5%) | 19 (10.5%) | 19 (10.5%) | |||
Surgery type | |||||||
Abdominal | 126 (35.6%) | 62 (34.3%) | N/A | 62 (34.3%) | 62 (34.3%) | 0.005 | 0.420 |
Breast | 2 (0.6%) | 5 (2.8%) | 1 (0.6%) | 5 (2.8%) | |||
Gynecology | 143 (40.4%) | 73 (40.3%) | 73 (40.3%) | 73 (40.3%) | |||
Lower orthopedic | 54 (15.3%) | 19 (10.5%) | 29 (6.0%) | 19 (10.5%) | |||
Thoracic | 29 (8.2%) | 12 (6.6%) | 16 (8.8%) | 12 (6.6%) | |||
Urology | 0 (0.0%) | 10 (5.5%) | 0 (0%) | 10 (5.5%) | |||
Interspace level | |||||||
A: Th3/4-Th7/8 | 34 (9.6%) | 15 (8.3%) | 0.484 | 19 (10.5%) | 15 (8.3%) | 0.288 | 0.169 |
B: Th8/9-Th12/L1 | 263 (74.3%) | 143 (79.0%) | 130 (71.8%) | 143 (79.0%) | |||
C: L1/2-L4/5 | 57 (16.1%) | 23 (12.7%) | 32 (17.7%) | 23 (12.7%) | |||
Removal method | |||||||
Scheduled | 347 (98.0%) | 171 (94.5%) | 0.036 | 176 (97.2%) | 171 (94.5%) | 0.291 | 0.139 |
Disconnection | 7 (2.0%) | 10 (5.5%) | 5 (2.8%) | 10 (5.5%) | |||