Prävalenz von Vitamin-C-Mangel und unzureichender Versorgung: Australien im internationalen Vergleich – ein Scoping-Review

Der Scoping-Review erfasste 107 Studien aus 31 Ländern und fand für Länder mit hohem Einkommen etwa 0 bis 15 % Vitamin-C-Mangel, bei großen Datenlücken.

Fragestellung und untersuchte Populationen

Die Autorinnen und Autoren wollten die Häufigkeit von Vitamin-C-Mangel und unzureichendem Status in gemeinschaftsbasierten Populationen beschreiben und Australien international einordnen. Hospitalisierte Personen waren ausgeschlossen.

Als Statusgröße diente Serum-Vitamin-C. Verglichen wurden Länder und Bevölkerungsgruppen. Der Review zielte damit auf die Verteilung in der Bevölkerung und nicht auf die Behandlung einzelner klinischer Fälle.

Wie die Evidenz gesucht und ausgewählt wurde

Die Arbeit folgte den methodischen Rahmen von JBI und PRISMA-ScR für Scoping-Reviews. Durchsucht wurden Scopus, PubMed und CINAHL. Berücksichtigt wurden Studien aus dem Zeitraum 2003 bis zum 21. November 2023.

Von 4.842 eindeutigen Treffern erfüllten 107 Studien aus 31 Ländern die Einschlusskriterien. Die im Quellenbereich ausgewiesenen Arbeiten bilden diese paketgebundene Review-Familie. Ihre Aufnahme belegt die Zugehörigkeit zum Review; sie wird hier nicht für zusätzliche, ungeprüfte Einzelstudienergebnisse genutzt.

Zentrales Ergebnis

Für Länder mit hohem Einkommen schätzt der Review die Prävalenz eines Vitamin-C-Mangels auf ungefähr 0 bis 15 %. Die Spannweite macht deutlich, dass die beobachtete Häufigkeit je nach Land, Population und Untersuchungsmethode variiert.

Die Zahl ist eine Revieweinordnung über unterschiedliche gemeinschaftsbasierte Studien. Sie ist keine Messung einer einzigen repräsentativen Welt- oder Australienstichprobe und erlaubt keine Aussage über den Status einer einzelnen Person.

Forschungslücken und Belastbarkeit

Der Review fand erhebliche geografische Lücken. Für viele Länder fehlen national repräsentative Daten. Besonders unzureichend ist die Datenlage bei Kindern und Jugendlichen.

Auch methodische Unterschiede begrenzen direkte Vergleiche. Variierende Populationen, Erhebungsbedingungen und Statusdefinitionen können dazu beitragen, dass Prävalenzwerte auseinanderliegen. Der Review kartiert den Forschungsstand breit, prüft aber nicht wie eine Interventionsmetaanalyse die Wirkung einer einheitlichen Maßnahme.

Fazit

Der Scoping-Review dokumentiert 107 Studien aus 31 Ländern und verortet die Mangelprävalenz in Ländern mit hohem Einkommen bei etwa 0 bis 15 %. Die breite Spannweite und fehlende repräsentative Daten – insbesondere für Kinder und Jugendliche – verlangen eine vorsichtige länder- und populationsbezogene Einordnung.

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