PubMed · 6020719
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C G Kramer. 1967. Chlorine.. https://pubmed.ncbi.nlm.nih.gov/6020719/
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OBJECTIVE: The aim was to study the reliability of the available data, stemming from the concordance between two different observers' measurement of the level of free residual chlorine. DESIGN: An observational, crossover study, using measurements of the level of free residual chlorine repeated on the same day by two different observers. SETTING: Health Area of Albacete. PATIENTS AND OTHER PARTICIPANTS: 176 double measurements of chlorine, carried out during the study period in 69 networks distributing different waters. MEASUREMENTS AND MAIN RESULTS: Concordance between observers on the absence or presence of chlorination was low (I.Kappa = 0.261), showing a bias in favour of the presence of chlorination in the measurements made by local technicians (McNemar p < 0.01). Applying a logistic regression model, it was observed that the risk of disagreement was as much as 8.5 times greater when chlorine measurement required the local technician to travel. CONCLUSIONS: We concluded that the data available was of questionable value and that it would be useful to put forward some new proposals to improve the supervision of the network.
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