highly significantp < 0.001
The interaction between calendar year and age group at diagnosis was highly significant (χ2(2) = 120.55, p < 0.001).
The interaction between calendar year and age group at diagnosis was highly significant (χ2(2) = 120.55, p < 0.001).
However, the overall trend in annual achievement proportions did not reach statistical significance by the supplementary Kendall’s tau analysis applied to annual aggregates (τ = 0.16, p = 0.29), likely reflecting year-to-year variability in the proportion of patients eligible for measurement in each calendar year.