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. 2023 Jul 27;22(1):7–19. doi: 10.2450/BloodTransfus.494

Table V.

Study reports for specific positive beliefs overall and by continent (No.=45)

Specific belief Study reports of beliefs Range % participants reporting beliefs in studies Mean % participants reporting beliefs in studies Median % participants reporting beliefs in studies No. (%) Continent study reports occurred
Label Qual No. Quant No. Total No. (%)
Immunity 1 - 1 (0.2) - - - 1 (100.0) North America
Vitality 3 3 6 (13.3) 3.2–4.0 3.7 4.0 1 (16.7) Asia
2 (33.3) Europe
3 (50.0) North America
Iron - 1 1 (0.2) 1.2–1.2 1.2 1.2 1 (100.0) Asia
Health risk/protective factors 3 7 10 (22.2) 0.3–67.7 23.0 17.5 1 (10.0) Africa
5 (50.0) Asia
1 (10.0) Europe
1 (10.0) North America
1 (10.0) Oceania
1 (10.0) South America
Physical appearance 3 6 9 (20.0) 0.3–43.9 11.9 3.6 2 (22.2) Africa
5 (55.6) Asia
1 (11.1) Europe
1 (11.1) South America
Improving blood 10 6 16 (35.6) 1.2–74.9 23.9 7.7 2 (12.5) Africa
5 (31.3) Asia
3 (18.8) Europe
1 (6.2) North America
1 (6.2) Oceania
4 (25.0) South America
Headaches - 2 2 (0.4) 1.0–31.5 16.3 16.3 1 (50.0) Asia
1 (50.0) Europe