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Census data were successfully linked to 90.2% of the records included in the study. However, due to the need to exclude households containing no usual residents and households imputed for the One Number Census, useable census data were obtained for 88.2% of responding and 84.7 % of non-responding households.
The non-response rate for households matched with census records was 28.3% (13.3% non-contacts and 15.0% refusals).