Measurements of Epidural Space Depth Using Preexisting CT Scans Correlate with Loss of Resistance Depth during Thoracic Epidural Catheter Placement

Table 1

Patient characteristics of sample ().

Continuous variable	Mean (SD)	Range
Age	56.8 (15.1)	20–90
BMI	28.1 (7.0)	15.5–53.9
CT epidural skin distance (mm)	46.7 (11.7)	27–86
Loss of resistance depth (cm)	6.1 (1.1)	3.5–8
Categorical variable	Number	%
Male (%)	85	51
BMI > 35 (%)	21	13
Epidural level (%)
T3	2	1.2
T4	9	5.4
T5	16	9.6
T6	24	14.5
T7	27	16.3
T8	46	27.7
T9	23	13.9
T10	12	7.2
T11	4	2.4
T12	3	1.9

LOR depth > 8 classified as 8 (see text).