First, the included studies were conducted among different population groups, and the measurement and categorisation of the sedentary behaviour were highly heterogeneous.
Also, anthropometric measurements and categorisation of malnutrition are based on standard reference growth standards and the study population is well characterised.
Due to differences in methods of measurement, analysis and categorisation of SES, cross-study comparisons were difficult and limited.
The heritability of NA could potentially be further increased if the angle measured was reported since categorisation simply adds measurement error and serves no predictive purpose.
Potential sources of heterogeneity between studies included study design, measurement of socioeconomic position, categorisation of reference groups and analysis of confounding.
The three aspects of resilience proved a useful categorisation of performance measurement though there is overlap between them.
We only wonder whether the measurements of CEA for such a categorisation should be more properly performed at a suitable interval after surgery (we suggest 5 6 weeks) – instead of or in addition to before surgery.
The scale showed valid psychometric properties and met the measurement requirements of invariance and proper item categorisation.
For the uni-dimensional measurement approach, the criteria for treatment response categorisation were also modified with PR being defined as >30% decrease in tumor diameter, SD being <30% reduction to <20% increase in diameter and DP being >20% increase in tumor diameter[ 8].
These categorisations form the fulcrum of statistical measurement of human rights [ 7, 9- 11].
On the one hand, these differences may reflect the more precise measures of physical activity used in the second health assessment, which may have not only enabled more accurate categorisation of cycling exposure, but also reduced measurement error regarding the confounding effect of 'other' physical activity.
