“…The outcome variables used in the included studies comprised content quality [ 12 , 18 , 19 , 21 , 23 , 25 , 26 , 30 , 31 ], accuracy [ 16 , 18 , 19 , 31 , 32 ], reliability or credibility [ 21 , 23 , 26 , 30 - 32 ], usefulness [ 15 , 24 , 28 ], view count [ 14 , 29 ], sharing count [ 14 ], video length [ 29 ], tone [ 13 ], source [ 13 ], clarity [ 16 ], actionability [ 20 ], satisfaction [ 17 ], acceptance [ 22 ], penetration [ 22 ], understandability [ 20 ], readability [ 28 ], education quality [ 30 ], sexual knowledge [ 27 ], sexual attitudes [ 27 ], and parent-child relationships [ 27 ]. The measurement tools included DISCERN (a set of quality criteria developed for written consumer health information) [ 18 , 19 , 21 , 23 , 26 , 30 , 31 ], self-developed tools [ 16 , 22 ,…”