Table 3 Baseline characteristics of study participants assigned to the ultrasound-assisted or the conventional puncture group to peripheral intravenous catheterization
| ultrasound-assisted group | . conventional puncture group | P-value | |
|---|---|---|---|
| Age (month) | 7(5–9) | 7(4–9) | 0.445 |
| Sex (male/female) | 48/24 | 43/29 | 0.449 |
| BMI (kg/cm2) | 16.31 + 1.94 | 16..56 + 2.24 | 0.186 |
| Previous history of difficult access, %(Y/N) | 15.3%(11/61) | 16.7%(12/60) | 0.803 |
| Comorbidity, %(Y/N) | 13.9%(10/62) | 5.6%(4/68) | 0.114 |
| Venous grading(I/II/III) | 5/13/54 | 4/11/57 | 0.509 |