uniform way before stability is reached at about age 23. Theta power in females shows a relatively constant rate of decrease of about 2.5% to 4% per year from 12 to 16 years of age, then the rate of decrease diminishes until about age 18, remains stable until age 20, and then increases to its previous level of between 2.5% to 4% at age 22 before stabilizing at about 2% around age 25. Note that male and female velocity curves are roughly parallel to each other until the age of 18, when their patterns sharply diverge. Differences greater than 0.015 (1.5%) between values at different ages are statistically significant at the p < 0.05 level, as determined by bootstrapping. Differences in slopes between males and females are statistically significant at the p < 0.05 level from ages 12 to 19.
