showed a trendp = 0.06
Sixteen year-olds performed better than the12-year-olds (mean differences = 2.50, 95% CI [0.32, 4.69], p < 0.05), yet 15 year-olds showed a trend of outperforming the 12-year-olds (mean differences = 2.27, 95% CI [−0.050, 4.58], p = 0.06).