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Re: Re: Urban area disadvantage and physical activity

Dear Editor,

As a reader, I found the paper[1] interesting, and I hope that the authors could provide extra information. In table 2, there were about one third of participants did not answer their income level in all the three area “SES” strata, However “Occupation” and “Education” may be associated with income level in the same way among all the participants. So the association between “Education”, “Occupation” and income level among people who reported their income, could be applied to predict or gain more information on the income level among people, who had provided information on their “Education”, “Occupation” but not on their income level. (Chi- Square test showed that the proportion of people who did not answer their income were significant associated with area “SES”)

People are likely to choose a place to live according to their life style, therefore people who are able to choose their living area, may choose a place that meets their physical activities needs, and people who have high income but choose a place not convenience for physical activities, may not like physical activities at all. However this possible confounder could be reduced by restricting the analysis to subjects who were unlikely to be able to choose a place to live, for example, those who are young or those who are in low income. These may lead to a large “CI”, but the mean of “OR” could be considered as a “point estimation”.

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