Low Body Mass Index and Blood Loss in Primary Total Hip Arthroplasty: Results from 236 Consecutive Ankylosing Spondylitis Patients

Table 1

Demographics and anthropometry of the study patients.

	Underweight group	Normal weight group	P
Number of patients	91	145
Age (y)*	36 (8)	37 (8)	0.485
Male/female	76/15	126/19	0.472^†
BMI (kg/m^2)*	17.0 (1.3)	21.9 (1.6)	<0.001
BV (L)*	3.92 (0.65)	4.56 (0.56)	<0.001

∗Mean (SD). ^†Chi-square test.
BMI: body mass index; BV: blood volume.