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Air pollution has short-term serial correlation; to ensure that all of our control days were independent, we chose control days matched on day of the week, in the same month and year as the event day.
Air pollution has short-term serial correlation, and to ensure that all of our control days were independent, we chose control days matched on day of the week in the same month and year as the event day.
Estimates from analyses with control days matched on day of the week were comparable to those with control days matched on temperature (data not shown).
We also performed a sensitivity analysis using an alternative selection strategy, with control days being matched on day of the week instead of daily temperature, thus also including the 76 cases that had no temperature-matched control day.
Using a time-stratified bidirectional approach for referent selection, control days were defined as all days in the same calendar month as the asthma visit, matched on day of the week (3 to 4 control periods per case).
We used time-stratified controls matched on day of the week or on temperature to detect possible residual confounding by weather.
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