It's great you're looking into ABA treatment intensity! Research shows that high-intensity ABA (25-40 hours per week) tends to lead to the most significant improvements in cognitive functioning, communication, and overall adaptive behavior for young children.

A meta-analysis showed a direct relationship between intensity and gains, with higher intensity leading to greater improvements. Comprehensive ABA, which addresses multiple areas, often requires at least 36 hours per week. Starting early, ideally before age 5, with higher intensity and then adjusting as needed can be very effective. You can find more info on studies about this at https://asatonline.org/researc....h-treatment/book-rev and https://www.casproviders.org/e....vidence-intensive-ea