The Motorik-Modul Study (MoMo) is part of the representative German Health Interview and Examination Survey for Children and Adolescents (KiGGS) of the Robert Koch-Institute in Berlin. From 2003-2006, the cross-sectional MoMo Baseline Study was carried out including 4,528 children and adolescents between the ages of 4 to 17 years.
In order to examine the longitudinal development of motor performance and physical activity levels, all children and adolescents that had participated in the baseline assessment were asked to complete follow-up assessments at MoMo Wave 1 (2009-2012) and Wave 2 (2014-2017). Currently, data collection as part of Wave 3 (2018-2021) is ongoing. Preliminary results are expected to become available in 2021.
The strength of MoMo is that it combines a longitudinal cohort sequential design with a cross-sectional representative cohort comparison (see figure). In addition to the longitudinal observation of the participants of the MoMo Baseline, there is a representative cross-sectional accumulation for every cohort in the age range between 4 and 17 years. This helps to minimise the validity threats of pure cross-sectional and pure longitudinal designs.