Regression calibration with instrumental variables for longitudinal models with interaction terms, and application to air pollution studies.

For those without colds, the SHS slope at a fixed level c for ambient fine particulate matter was greater than the slope of ambient fine particulate matter slope at level c of SHS with marginal significance ( p = 0.047), while it was very insignificant for those with colds.

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In the absence of SHS, well children had a marginally significant relationship between ambient fine particulate matter and log(LTE4), while there was no apparent relationship when children were sick (last row, Table 3 ).

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