Results
Eighty one of the 150 videos were excluded from the study due to
exclusion criteria, and the remaining 69 videos were analyzed.
The descriptive statistics of the YouTube videos are presented in Table
1. The mean number of views for the videos on vertigo was 747,452.4 (min
– max: 1,944 – 7,959,884, median: 166,229). The mean length of the
videos was 357.2 seconds (min – max: 79 – 1,764 seconds, median: 266
seconds). The average number of days since the videos were uploaded was
1,447.1 days (min – max: 220 – 4,218 days, median: 1,288 days). The
mean viewing rate of the videos was 44,928.2 (min – max: 153.7 –
348,506.3, median: 16,737.8). While the overall mean number of likes of
the videos was 4,608.3 (min – max: 10 – 35,060, median: 1,698.5), the
average number of dislikes was 222.7 (min – max: 1 – 1,772, median:
62). The mean number of comments made to the videos was 359.6 (min –
max: 0 – 2,656, median: 137). The mean interaction index was 0.88 (min
– max: 0.05 – 2.79, median: 0.73), while the mean video power index
was 94.6 (min – max: 81 – 99.7, median: 95.6). The average number of
views per day of the videos was 449.3 (min – max: 1.5 – 3,485.1,
median: 167.4).
The mean total content score, GQS and modified DISCERN scores of the
videos were 3.42 (min – max: 0 – 8), 2.48 (min – max: 1 – 5) and
2.09 (min – max: 0 – 5), respectively (Table 1).
It was seen that most of the videos were uploaded by healthcare
professionals (n = 25, 36.2%), followed by other (n = 19, 27.5%),
hospital / university (n = 18, 26.1%), commercial (n = 4, 5.8%) and
layperson (n = 3, 4.3%). It was found that most of them were
educational videos (n = 63, 91.3%), meaning videos that give
information about vertigo, while a small part was testimonial videos (n
= 6, 8.7%), meaning videos where people share their personal
experiences (Table 2).
66.7% (n = 46) of the videos were included in the low content group,
while 33.3% (n = 23) were included in the high content group (Table 3).
The differences in sources of upload and video type between the high and
low content videos were not statistically significant (p= 0.122, p=
0.168) (Table 3). Among the items used in content scoring, the most
mentioned items in the videos were maneuvers (n = 47, 68.1%), treatment
(n = 37, 53.6%), and symptoms (n = 38, 55.1%), respectively, while the
least mentioned items were alarm symptoms (n = 6, 8.7%), prognosis (n =
8, 11.6%), and types of vertigo (n = 17, 24.6%), respectively.
In Table 4, high and low content videos are compared according to video
characteristics and no significant difference was found between the two
groups in terms of video characteristics (p> 0.05). GQS was
found significantly higher in high content videos than low content
videos (p< 0.001). Modified DISCERN was found significantly
higher in high content videos than low content videos (p<
0.001) (Table 4).
In Table 5, educational and testimonial videos are compared according to
video characteristics and no significant difference was found between
the two groups (p> 0.05).
Spearman’s correlation analysis showed that significant positive
correlations were found between GQS and total content score (r= 0.873,
p< 0.001), between modified DISCERN and total content score
(r= 0.883, p< 0.001) and between modified DISCERN and GQS (r=
0.900, p< 0.001) (Table 6). There was no statistically
significant relationship between total content score and video
demographics (p> 0.05). There was no statistically
significant relationship between GQS and video demographics
(p> 0.05). There was no statistically significant
relationship between modified DISCERN and video demographics
(p> 0.05) (Table 6).