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In cases where the resultant unit values were meaningless, we cleaned the data following the conventions described in van der Zee et al .7 The cleaned data gives a sample of 6820 households, of which 1341 (19.7%) reported positive tobacco consumption

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Part of this data process included combining or collapsing 5-point Likert responses into 3-point responses, so the expected values were equal to or greater than 5, thereby meeting the basic assumption of analysing categorical data using the chi-square test