Ramírez-Aguilar M, Barraza-Villarreal A, Moreno-Macías H, Winer AM, Cicero-Fernández P, Vélez-Márquez MGD, Cortez-Lugo M, Sienra-Monge JJ, Romieu I

Idioma: Ingles.
Referencias bibliográficas: 25
Paginas: 67-75
Archivo PDF: 187.58 Kb.

RESUMEN

Objective. A study was conducted to evaluate personal ozone exposure (O_3p) among asthmatic children residing in Mexico City. Material and Methods. A total of 158 children were recruited from December 1998 to April 2000. On average, three O_3p measurements were obtained per child using passive badges. Time-activity patterns were recorded in a diary. Daily ambient ozone measurements (O_3a) were obtained from the fixed station, according to children’s residence. Levels of O_3a and ozone, weighted by time spent in different micro-environments (O_3w), were used as independent variables in order to model O_3p concentrations using a mixed-effects model. Results. Mean O_3p was 7.8 ppb. The main variables in the model were: time spent indoors, distance between residence and fixed station, follow-up group, and two interaction terms (overall R²=0.50, p‹0.05). Conclusions. The O_3w concentrations can be used as a proxy for O_3p, taking into account time-activity patterns and the place of residence of asthmatic Mexican children.

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