Here are a few options, depending on your specific focus:
Option 1 (Most formal and direct):
“EU Survey Establishes Correlation Between Screen Time and Child Wellbeing”
Option 2 (More academic):
“The Impact of Screen Time on Child Wellbeing: Findings from an EU Survey”
Option 3 (Concise and professional):
“EU Survey Reveals Link Between Digital Consumption and Child Wellbeing”
Recommendation: “EU Survey Establishes Correlation Between Screen Time and Child Wellbeing” is the most professional and standard choice for a report or article.