For instance, in 2015, an average of 72% of disadvantaged 15-year-old students and 82% of advantaged students had attended ECEC for at least two years. Studies show' that locally focussed actions and interventions, especially those targeted at the youngest, can be effective in changing behaviours and decreasing the odds of, for example, being overweight during adolescence. This correlation is stronger for boys than for girls, and shows that early interventions by qualified staff can contribute to forming healthy behaviours. However, from a labour market perspective, the availability of full-day ECEC services is a crucial factor that enables parents of young children, especially mothers, to take up near full-time employment and secure higher earnings.