Table 3.

Observer participation^a by observer characteristics and web-based study platform (MPEG4 video and DICOM viewer)

	MPEG4 video (n = 63)				P value	DICOM viewer (n = 80)				P value
	Observers that not completed the evaluation		Observers that completed the evaluation			Observers that not completed the evaluation		Observers that completed the evaluation
	n	%	n	%		n	%	n	%
Sex					0.99					0.46
Male	16	100	45	96		40	87	32	94
Female	0	0	2	4		6	13	2	6
Area					0.43					0.14
USA	2	13	6	13		12	26	6	18
Europe	8	50	30	64		16	35	16	47
Asia	2	13	2	4		4	9	4	12
Canada	0	0	3	6		1	2	4	12
Other	4	25	6	13		13	28	4	12
Years in independent practice					0.51					0.45
0–5	4	25	18	38		12	26	7	21
6–10	4	25	11	23		12	26	14	41
11–20	4	25	13	28		15	33	7	21
21–30	4	25	5	11		7	15	6	18
Specialization					0.66					0.94
General orthopedics	4	25	8	17		6	13	5	15
Orthopedic traumatology	10	63	34	72		33	72	25	74
Other	2	13	5	11		7	15	4	12
Supervision of trainees					0.41					0.99
Yes	13	81	42	89		41	89	31	91
No	3	19	5	11		5	11	3	9

^a Participation of observers that started with the evaluation