[Evaluation of the surveillance system of chlorination of public water supply in the province of Albacete].
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.


METHODS
An observational, crossover study, using measurements of the level of free residual chlorine repeated on the same day by two different observers.


METHODS
Health Area of Albacete.


METHODS
176 double measurements of chlorine, carried out during the study period in 69 networks distributing different waters.


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.
Martínez Ferrando
R
R
Delegación Provincial de Sanidad, Albacete.
Almar Marques
E
E
Mateos Ramos
A
A
Navarro Honrubia
C
C
D002713:Chlorine; D016015:Logistic Models; D013030:Spain; D014881:Water Supply / Q000592:standards*
D002713:Chlorine
Valoración del sistema de vigilancia de cloración de aguas de abastecimiento público en la provincia de Albacete.