Table 1 Demographic characteristics of 96 patients included in the multiple logistic regression analysis

Age, months

22 (13-34)

Sex, male

66

Height, cm

80 (72-92)

Weight, kg

11 (9-13)

Venous depth at puncture site, mm

1.8 (1.4-2.7)

Diameter of target vein, mm

1.4 (1.2-1.7)

Puncture site, dorsal/cephalic

62/34

Systolic blood pressure, mm Hg

90 (82-102)

Diastolic blood pressure, mm Hg

47 (40-55)

With ultrasound guidance

65

Trisomy 21

3

ASA-PS

PS 1

64

PS 2

15

PS 3

16

PS 4

1

PS 5

0

Catheterisation time, s

43 (25-180)

Number of trials, times

1 (1-1)

Total success rate, %

66.7