Information in Spanish on YouTube about Covid-19 vaccines

Figures & data

Table 1. Country of publication, month, and type of source and publication of the videos

	Frequency, n (%)
Country of publication
Mexico	42 (35.6)
The United States of America	18 (15.3)
Colombia	15 (12.7)
Spain	13 (11.0)
Argentina	12 (10.2)
Chile	5 (4.2)
Germany	4 (3.4)
United Kingdom	4 (3.4)
Peru	3 (2.5)
Venezuela	1 (0.8)
Dominican Republic	1 (0.8)
Type of source
Media		68 (57.6)
User-generated content		28 (23.7)
Health professionals		19 (16.1)
Others		3 (2.5)
Type of publication
News		50 (42.4)
Material created by the user		48 (40.7)
Interviews		14 (11.9)
Advertisements		3 (2.5)
Documentaries		3 (2.5)
Month of publication
March-April 2020		7 (5.9)
May-June 2020		6 (5.1)
July-August 2020		19 (16.1)
September-October 2020		8 (6.8)
November-December 2020		47 (39.8)
January-February 2021		31 (26.3)

Table 2. Quantitative characteristics of the videos and message tone

	Positive videos (n = 63)	Neutral videos (n = 38)	Ambiguous videos (n = 16)	Negative (n = 1)	p-Value
Nº views					0.201
Total	30,497,303	16,355,625	10,172,318	365,254
Median (range)	327,588 (150,015–3,975,728)	251,129.5 (150,032–2,935,282)	461,911 (191,075–2,852,666)	-
Video length					0.017
Total (seconds)	118,248	19,208	12,369	243
Median (range)	513 (15–10,360)	261 (20–5,017)	650.5 (127–2,551)	-
Nº likes					0.379
Total	968,771	473,915	170,953	18,426
Median (range)	7,693 (0–73,241)	4,059 (398–155,928)	7,557 (2,301–44,021)	-
Nº dislikes					0.043
Total	41,262	21,752	17,910	1,859
Median (range)	455 (0–3,489)	318 (67–5,325)	644 (153–4,024)	-
Nº comments					0.170
Total	111,327	60,451	34,441	6,418
Median (range)	1,547.5 (0–11,005)	1,287 (101–8,281)	1,601 (531–6,919)	-

Table 3. Quantitative characteristics of the videos and type of source

	Media (n = 68)	User-generated content (n = 28)	Health professionals (n = 19)	Others (n = 3)	p-Value
Nº views					0.143
Total	31,565,295	14,089,956	10,742,825	992,424
Median (range)	259,891.5 (150,015–3,975,728)	471,109 (191,075–958,917)	316,177 (192,873–2,935,282)	320,446 (178,027–493,951)
Video length					0.000
Total (seconds)	28,684	102,951	17,910	523
Median (range)	268.5 (20–2,551)	1,138 (239–10,360)	636 (15–2,847)	84 (58–381)
Nº likes					0.000
Total	401,343	823,152	404,901	2,669
Median (range)	3,154.5 (398–36,490)	32,617 (2,617–73,241)	9,492 (0–155,928)	104 (22–2,543)
Nº dislikes					0.000
Total	35,640	25,805	20,997	341
Median (range)	323.5 (31–3,782)	669 (191–4,024)	539 (0–5,325)	37 (6–298)
Nº comments					0.002
Total	100,876	71,480	39,483	798
Median (range)	1,263 (101–6,919)	2,174 (531–11,005)	1,538 (0–8,281)	0 (0–798)

Table 4. Topics related to the Covid-19 vaccines discussed in the videos

Topic	Discussed, n (%)	Not discussed, n (%)
Covid-19 vaccines are safe	51 (43.2)	67 (56.8)
Target groups for vaccination	46 (38.9)	72 (61.1)
Recommendation for healthcare workers	38 (32.2)	80 (67.8)
Recommendation for all persons over 18 years of age	15 (12.7)	103 (87.3)
Recommendation for persons 60/65 years of age or older	12 (10.2)	106 (89.8)
Recommendation for seniors	13 (11.0)	105 (89.0)
Recommendation for persons with chronic diseases	11 (9.3)	107 (90.7)
Recommendation for all persons over 80 years of age	6 (5.1)	112 (94.9)
Recommendation for teachers	6 (5.1)	112 (94.9)
Recommendation for all persons over 70 years of age	3 (2.5)	115 (97.5)
Recommendations for institutionalized persons in nursing homes	3 (2.5)	115 (97.5)
Recommendation for the armed and security forces	2 (1.7)	116 (98.3)
Recommendation for pregnant women	1 (0.9)	117 (99.1)
Adverse effects of the Covid-19 vaccines	45 (38.1)	73 (61.9)
Benefits of the Covid-19 vaccines	41 (34.8)	77 (65.2)
Efficacy of the Covid-19 vaccines	37 (31.4)	81 (68.6)
Description of the dosage	35 (29.7)	83 (70.3)
Costs of the vaccine	26 (22.0)	92 (78.0)
Vaccination free of charge	20 (16.9)	98 (83.1)
Vaccination is optional	17 (14.4)	101 (85.6)
Cautions and contraindications of the Covid-19 vaccines	12 (10.2)	106 (89.8)
If you have passed the Covid-19, you can be vaccinated	3 (2.5)	115 (97.5)

Figure 1. Number of videos according to the message tone and topics discussed over time.