Roman numbers stand for data from survey waves 1 to 5, respectively.
Most countries have about 1,000 respondents (older than 15) for each survey wave (mostly one wave per year).
We adjust for inflation by reporting all wages in constant dollars and then drop the top and bottom 2.5% of the reported person-year wages for every survey wave.
For every survey wave, the Institute will conduct a source data validation of a 1% random sample of all questionnaires to calculate input data errors.
* Note: in 2008, a fifth Housing Improvement Area (Birness Drive) was selected to collect data on more popular multi-storey flats - bringing the total number of GoWell areas to 15 for the second survey wave.
This study used the district-weighted data for Chicago, New York City and Los Angeles from the survey wave years 2007, 2009, 2011 and 2013.
The respondents indicated a smaller estimated probability of an epidemic outbreak in the second survey wave (for a mean of 27.2) than in the first and third survey waves (for means of 31.6 and 33.0, respectively; Ps<0.001), with no significant difference between the first and third survey waves (P = 0.10).
Respondents indicated a greater daily dose in the first survey wave (for a mean of 62.6) than in the second and third survey waves (for a mean of 58.3, 58.6, respectively; Ps = 0.001), with no significant difference between the second and third survey waves (P = 0.83).
Descriptive statistics on individual demographic variables and BMI in each survey wave for men and women were analysed separately to illustrate the adjusted trends in the sample.
For each venue, both crude and adjusted odds ratios (OR and AOR, respectively) were estimated for sociodemographics, smoking behaviour, survey wave and residence (i.e. capital city vs other cities).
