This suggested increased headache prevalence of 8%, although this is not quite statistically significant at the 95% level since the confidence interval span across zero (null effect).
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The relationship between adolescents' well-being and their wireless phone use: a cross-sectional study.
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The sentences
Those with p < 0.1 were included in ordinal logistic regression models used to assess RF-EMF associations; this level was selected at the preliminary stage to ensure not excluding those of marginal significance.
Where a cross-tabulation indicated only one frequency was likely to be significant, the others were grouped as one category.