“…In children and adolescents with CHD, the data regarding HRQoL are inconsistent. Some studies report worse HRQoL in patients with CHD,6–8 while others describe equal or even higher scores in meta-analysis9 and primary studies 10–13. The lack of comparability among the available studies is owed to poor methodological standardisation, use of different types of questionnaires, heterogeneity of the examined cohort, small sample sizes or non-existence or inappropriate control group.…”