Observational Study
Copyright ©The Author(s) 2023.
World J Gastroenterol. Jun 21, 2023; 29(23): 3688-3702
Published online Jun 21, 2023. doi: 10.3748/wjg.v29.i23.3688
Table 2 Data used in environmental exposure modeling
Variable
Description
Data source and database
IncomeMean of 2005 (adjusted to 2015 dollars) and 2015 census average family income for Local Health AreasStatistics Canada, BC Community Health Atlas
EthnicityCensus percent of the population of South Asian, Indigenous, Chinese, Jewish, and Non-Jewish European ethnic originStatistics Canada, University of Toronto Computing in the Humanities and Social Sciences Data Centre
Family sizeCensus average family sizeStatistics Canada, University of Toronto Computing in the Humanities and Social Sciences Data Centre
RuralityPercent of residents in each Local Health Area who lived outside a census metropolitan area or census agglomerationStatistics Canada
NDVI greennessGreen vegetation cover calculated from land satellite imagery of surface reflection. Maximum and average growing season (May – August) NDVI within 250 m from postal code location. Multiplied by 100 so changes could be assessed as percentagesUnited States Geological Survey, Canadian Urban Environmental Health Research Consortium
UV vitamin DLong-term stable monthly mean daily vitamin D dose from solar UV radiation adjusted for postal code elevation (J/m-2) which was averaged for winter (December through February) and summer (June through August)Environment Canada and Cancer Care Ontario, Canadian Urban Environmental Health Research Consortium
NO2 air pollutionAnnual average NO2 concentration in parts per billionCanadian Urban Environmental Health Research Consortium
O3 air pollutionAverage of O3 taken from the highest rolling 8-hour daily average concentration (parts per billion)Environment and Climate Change Canada, Canadian Urban Environmental Health Research Consortium
PM2.5 air pollutionAnnual average surface PM2.5 (μg/m3) concentrationAtmospheric Composition Analysis Group, Canadian Urban Environmental Health Research Consortium
Metam pesticide2015 metam pesticide applied to fruits and vegetables (kg/ha/yr)Global Pesticide Grids, Version 1.01, based on the United States Geological Survey’s Pesticide National Synthesis Project and the Food and Agriculture Organization Corporate Statistical Database pesticide databases
Petroleum oil pesticide2015 petroleum oil employed for grapes and orchards (kg/ha/yr)Global Pesticide Grids, Version 1.01, based on the United States Geological Survey’s Pesticide National Synthesis Project and the Food and Agriculture Organization Corporate Statistical Database pesticide databases
Glyphosate pesticide2015 total glyphosate employed in major crops (wheat, corn, alfalfa, and others) in (kg/ha/yr)Global Pesticide Grids, Version 1.01, based on the United States Geological Survey’s Pesticide National Synthesis Project and the Food and Agriculture Organization Corporate Statistical Database pesticide databases
Population age 0-16.9Yearly estimates of population age 0-16.9 for Local Health Areas averaged for 2001–2016Statistics Canada, BC Stats