- Interpretation example: In England, in the group of the highest performing students (upper 20th percentile) the proportion of male students was 4.5% higher than the proportion of female students at grade 4 in 1995 (significant gap). Four years later, this gap has increased to 11.9% (significant gap). The gap change of 7.1% is significant
- * Significant gap (p < 0.05)