Table 2.

Comparison between the broken and control groups.

Characteristics	Broken group(n = 7)	Control group(n = 18)	P
Age (years)	73.6 ± 7.1	76.6 ± 11.7	.530
Gender
Male	4	5	.205
Female	3	13
Height (cm)	166.1 ± 5.6	156.0 ± 7.9	.008
Weight (kg)	64.9 ± 13.61	54.7 ± 9.7	.004
BMI (kg/m2)	25.1 ± 3.08	22.6 ± 4.20	.168
ASA class	2.1 ± 0.69	2.3 ± 0.58	.135
Anesthesia
General	2	12	.083
Spinal	5	6
CCD angle
125°	2	11	.202
130°	5	7
Horizontal offset (mm)	54.0 ± 5.2	44.8 ± 6.1	.005

ASA = American Society of Anesthesiologists, BMI = body mass index, CCD = centrum-collum-diaphyseal.