Table 2.

Logistic regression analysis, examining the primary outcome variable, attainment of fluid with hip aspiration (yes/no). BMI = body mass index. CI = confidence interval. OR = odds ratio.

	OR	95% CI	p
Ultrasound guidance	2.075	1.382, 3.117	<0.001
Trainee present	1.215	0.810, 1.824	0.347
Female sex	1.086	0.726, 1.624	0.690
Age	1.003	0.989, 1.018	0.644
BMI	0.973	0.950, 0.998	0.033
History of arthroplasty	1.408	0.908, 2.182	0.127