Table 4.

Video characteristics for included YouTube videos

Characteristic	Mean±SD	Range
Video duration	412.7±285.1	60–1,407
Views	317,500.7±538,585.3	35–2,298,983
Days since upload	1,639.1±1,171.0	2–3,929
View ratio	297.5±446.2	0.4–1879.2
Comment	224.7±428.0	0–2,301
Like	3,908.3±8,783.4	1–39,000
Dislike	98.4±144.8	0–539
Like ratio	95.3±4.5	83.3–100
VPI	296.9±435.3	0.36–1861.5

SD: standard deviation, VPI: video power index.