Table 3.

Detailed characteristics of “useful videos” on YouTube uploaded by different sources.

Characteristics	Hospital/university channel	Independent user channel	Medical dotcom channel	News agency channel
Useful videos, N=214 (%)	88 (41.1)	40 (18.7)	22 (10.3)	64 (29.9)
Total duration in minutes, 1723.7 (%)	657.05 (38.12)	320.40 (18.59)	263.00 (15.26)	483.25 (28.03)
Mean duration in minutes (SD)	7.47 (14.04)	8.01 (8.21)	11.95 (21.55)	7.55 (11.35)
Mean number of days on YouTube (SD)	558.67 (456.60)	641.07 (657.85)	412.14 (377.99)	637.53 (456.25)
Mean scores (SD), range	6.70 (34.80) 1 to 327	35.98 (103.36) 1 to 514	6.09 (13.62) 1 to 58	22.47 (126.70) 42 to 979
Total viewership (n) (%)	310,252 (14.26)	1,036,597 (47.64)	88,925 (4.09)	740,071 (34.01)
Mean views/day (SD), range	6.02 (23.82)a 0.07-220.87	39.36 (107.42)a,b 0.02-523.26	10.08 (20.89) 0.08-74.50	11.49 (34.40)b 0.02-224.75

^a P=.006

^b P=.046