. 2022 Sep 14;34:266–270. doi: 10.1016/j.jor.2022.09.010

Table 1.

Demographic data for subjects included in the study, n = 433. BMI = body mass index. Fluoro = Fluoroscopy. SD = standard deviation. US = ultrasound. ^aFrom independent t-test.

		All				Fluoro		US		p value
		n	%	mean	SD	n/mean	%/SD	n/mean	%/SD
Age				60.5	14.1	61.6	14.3	59.4	13.8	0.111^a
BMI				31.0	8.2	31.7	8.9	30.3	7.5	0.082^a
Sex	M	193	44.6%			97	46.0%	96	43.2%	0.568^b
	F	240	55.4%			114	54.0%	126	56.8%
Trainee present	Yes	248	57.3%			129	63.6%	119	54.6%	0.062^b
	No	173	40.0%			74	36.4%	99	45.4%
	Missing	12	2.7%
Specialty	Sports medicine	318	73.4%			98	46.5%	220	99.1%	<0.001^b
	Radiology	112	26.1%			112	55.1%	1	0.45%
	Pain medicine	2	0.46%			1	0,47%	1	0.45%
Fluid appearance	Blood	27	6.2%			9	7.5%	18	12.1%	0.002^b
	Blood-tinged joint fluid	108	24.9%			48	40.0%	60	40.3%
	Hazy/cloudy	36	8.3%			8	6.7%	28	18.8%
	Purulent	14	3.2%			5	4.2%	9	6.0%
	Transparent	84	19.4%			50	41.7%	34	22.8%
Arthroplasty	Yes	300	69.3%			159	75.4%	141	63.5%	0.008^b
	No	133	30.7%			52	24.6%	81	36.5%
Image guidance	Fluoroscopy	211	48.7%
	Ultrasound	222	51.3%

From χ² test.