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Table 2 Overall scientific quality of the prospective cohort studies

From: Effect of gargling with tea and ingredients of tea on the prevention of influenza infection: a meta-analysis

Newcastle-Ottawa scale
Study Iwata et al. 1997 Yamada et al. 2006
Criterion [17] [18]
Selection (range, 0–4 stars) *** ***
Comparability (range, 0–2 stars) * *
Outcome (range, 0–3 stars) *** ***
  1. * One asterisk represents one star