In each of the years assessed, BD prevalence showed an increasing trend with higher categories of TTHM exposure, with the exception of 2001 ( Table 3 ).
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Risk of birth defects in Australian communities with high levels of brominated disinfection by-products.
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The sentences
The mean square errors and F -test value ( F = 204292.41; p < 0.00001) indicated highly significant between-group differences and relatively little within-group variability for the specified category cutoff points.