Test of Gross Motor Development

The test of gross motor development (TGMD-3) measures 13 fundamental motor skills, subdivided into two subscales: locomotor and ball skills. The two subscales scores are combined to form the Gross Motor composite. Performance evaluation was performed according to the Ulrich (2000) protocol. The assessment was performed only at BDC and POST. Only raw scores were taken into the analysis. All performances were videotaped and later analyzed by two independent researchers. The reliability of measurements was established according to Vernadakis et al. (2015). Specifically, 30% of children’s scores at BDC and POST were analyzed for between researchers (BR) and between days (BD; day1 and day10) reliability by using the intraclass correlations coefficient (ICC) (with 95% confidential intervals). ICC values were interpreted as proposed by Malcata et al. (2014) as follows: >0.99, extremely high; 0.99–0.90, very high; 0.75–0.90, high; 0.50–0.75, moderate; 0.20–0.50, low; and <0.20, very low. The ICC₍₂,₁₎ revealed a very high reliability between researchers (BR – day1) in both measurements (ICC_PRE–TEST = 0.894; ICC_POST–TEST = 0.877). Very high ICCs₍₃,₁₎ were also confirmed for between-day (BD – day1:day10) reliability (ICC_PRE–TEST = 0.881; ICC_POST–TEST = 0.891). In all ICCs, the 95% CI ranged from 0.863 to 0.899.