Table 1 Variable definitions, sources and measures and characteristics of the Virginia localities
From: Spatial analysis of colorectal cancer outcomes and socioeconomic factors in Virginia
Variable Name | Variable Type | Data Source; details | Measure | Mean [Minimum, Maximum] |
|---|---|---|---|---|
Incidence | Outcome | State Cancer Profiles 2011–2015 [12]; annual estimate of invasive cancer diagnoses with 95% confidence interval. Age adjusted incidence based on 2000 US standard population. | Annual CRC diagnoses per 100,000 population | 39.4 (22.7,70.0) |
Mortality | Outcome | State Cancer Profiles 2011–2015 [12]; annual estimate of CRC attributable deaths with 95% confidence interval. Age adjusted incidence based on 2000 US standard population. | Annual CRC deaths, per 100,000 population | 16.5 (8.2,32.5) |
Mortality- incidence ratio (MIR) | Outcome | CRC mortality rate divided by incidence rate for each locality for which both data points were available | Ratio expressed as decimal | 0.43 (0.26,1.08) |
AA population | Independent | Racial category in US Census data 2010 [32] | Percent of population | 18.9 (0.10,79.10) |
Rural-urban status | Independent | US Department of Agriculture Economic Research Service 2013 [33]; Rural Urban Continuum Codes based on urban population within locality and adjacency to other metropolitan areas | Ordinal scores 1–9; 1–3 are metropolitan, 4–9 are non-metro | 3.72 (1,9) |
SES index | Independent | Appalachian Regional Commission 2017 [34]; composite index of unemployment, per capita income, poverty. | Index value based on 100 as US average; lower index indicates higher SES | 101.6 (47.2166.7) |
CRC screening rate | Independent | Small Area Estimates 2008–2010 [35]; estimates based on Behavioral Risk Factor Surveillance Survey question on self-reported previous screening. | Percent of population | 63.1 (33.2,88.8) |
PCP density | Independent | HRSA Area Health Resource Files 2011–2015 [36]; count for each year by locality | PCPs per 100,000 population; sum of PCPs for each year, divided by locality population for each year, then multiplied by 100,000 | 61.9 (0,323.2) |
GI density | Independent | HRSA Area Health Resource Files 2011–2015 [36]; count for each year by locality | GIs per 100,000 population; sum of GIs for each year, divided by locality population for each year, then multiplied by 100,000 | 2.7 (0,43.3) |