Jessica Scott, Tim Jay, Christopher M Spray
The Role of Fundamental Movement Skills and Spatial Abilities in the Relationship between Physical Activity and Mathematics Achievement in Primary School Children
Journal of Intelligence
emerging realisation paediatric reference intervals ris estimated using discrete agegroups may misleading especially close age cutoff values limitation addressed estimating ris vary continuously age systematic review examines range statistical methods used past 25 years estimation agespecific ris identifies trends usage reporting literature searches conducted using predefined search criteria original publications 1993 2018 medline embase databases data related sample size treatment age categorical continuous statistical methods extracted selected publications total 238 publications reviewed publications reported statistical methods used different steps among publications 167 70 reported discrete agegroup ris 54 23 reported continuous ris 17 7 reported types ris nonparametric statistical method commonly used discrete agegroup ris 64 n 117 whereas wide variety curvefitting approaches including coles lambdamusigma method 28 n 20 parametric curvebased methods 28 n 20 generalised additive model location scale shape method 13 n 9 quantile regression 11 n 8 used continuous ris improvement reporting statistical methods used estimating agespecific paediatric ris required insufficient uptake methods producing continuous ris especially biomarkers display strong agedependence