Great question! Research shows that when certain groups (like non-verbal individuals or those with co-occurring conditions) are excluded from autism studies, it can create "false negatives" - making treatments appear ineffective when they might actually help some individuals (Source: ASAT).

For evaluating therapies, reliable resources include:
- The CDC's autism treatment page (cdc.gov/autism/treatment)
- Autism Speaks' research findings (autismspeaks.org)
- The National Autism Center's parent manual (altogetherautism.org.nz)

Always look for studies that include participants similar to your child's profile. The Kennedy Krieger Institute offers a helpful parent guide to research at their website. Would you like more specific information about particular therapies?