Table 2

Potential correlates of 20mSRT performance in children and youth

VariableData sourceDescription
Childhood obesity (%)Ng et al 33
Data available for 49 countries
Calculated as the mean country-specific proportion of boys and girls aged <20 years that classified as obese based on the International Obesity Task Force definition. Countries with a higher proportion received a higher rank.
Physical activity (%)Kalman et al 34
Data originally obtained from HSBC study
Data available for 22 developed countries
Calculated as the mean country-specific percentage of boys and girls aged 11, 13 and 15 years that achieved at least 1 hour of moderate-to-vigorous physical activity per day. Countries with a higher proportion received a higher rank.
Mean climate (°C)Weatherbase35
Data available for 50 countries
Calculated across the number of years and cities where data were available (ie, Canada had 26 years of data across 2287 cities). Colder countries received a higher rank.
HDIThe United Nations36
Data available for 50 countries
Summarises country-specific achievement in a variety of indicators related to standards of living through a scale from 0.456 (low HDI) to 0.889 (very high HDI). High HDI received a higher rank.
Gini indexThe World Bank37
Data available for 48 countries
Summarises the distribution of wealth among individuals in a country where 0 represents perfect equality and 100 implies perfect inequality. Countries closest to inequality received a higher rank.
Urbanisation (%)The World Bank38
Data available for 46 countries
Proportion of the population that reside in an urban area within the country. Countries with a higher percentage of urban areas received a higher rank.
  • 20mSRT, 20 m shuttle run test; HDI, human development index.