Fig. 1From: Nasopharyngeal microbiota composition of children is related to the frequency of upper respiratory infection and acute sinusitisPermutation testing of non-metric dimensional scaling based on a Canberra distance matrix identifies acute sinusitis history (yes n = 14, no n = 33) as significantly (P ≤ 0.01) related to the observed variation in NP bacterial community composition upon entry to the study. Ellipses indicate 95 % confidence interval, stress = 0.1226Back to article page