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To estimate the reliability of a short-term measure of daily exposure to chlorpyrifos for individuals, we computed the intraclass correlation coefficient of reliability (R) with indoor air, carpet dust, and food concentration data. Theta coefficients are usually greater than or equal to the alpha coefficient of reliability. Finally, we computed the intraclass correlation coefficient of reliability (R) according to the classic error model, where R is the ratio of between-person variance of exposure to the total variance of exposure observed in a repeated measure study (14). |
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