L2-3

mean

SD

95% CI

Accuro*

5.74

1.19

(4.93 - 6.53)

Standard US

6.00

1.14

(5.22 - 6.76)

Needle insertion depth**

6.51

1.06

(5.79 - 7.22)

L3-4

mean

SD

95% CI

Accuro*

5.54

0.88

(5.22 - 5.84)

Standard US

5.81

0.84

(5.64 - 6.13)

Needle insertion depth**

6.25

0.92

(5.98 - 6.51)