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The effect of irradiation with ultra-violet light on the frequency of attacks of upper respiratory disease (common colds)
Doull JA, Hardy M, Clark JH, Herman NB
American Journal of Hygiene 1931;13:460-477
clinical trial
6/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

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