The number of communication modes used during intervention does not statistically moderate AAC treatment effects¶

Claim · All claims
Evidence · 1 study (2 entries) · quant-synthesis r3 · q3
Currency · newest study 2022 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i? Average Tau did not differ significantly across studies using one, two, or three or more communication modes (F(2,22.9) = 1.1, p = 0.345). → Ganz 2022 q3 i? Average LRR also did not differ significantly by number of modes (F(2,12.4) = 0.0, p = 0.992). → Ganz 2022 (2)

Evidence¶

Ganz 2022¶

Ganz, J. B., Pustejovsky, J. E., Reichle, J., Vannest, K. J., Foster, M., Fuller, M. C., Pierson, L. M., Wattanawongwan, S., Bernal, A. J., Chen, M., Haas, A. N., Skov, R., Smith, S. D., & Yllades, V. (2022). Augmentative and Alternative Communication Intervention Targets for School-Aged Participants with ASD and ID: a Single-Case Systematic Review and Meta-analysis. Review Journal of Autism and Developmental Disorders. doi:10.1007/s40489-022-00326-6

q3 · i? · quant-synthesis · r3

Model A Tau results across studies categorized as one mode (k = 68), two modes (k = 29), or three or more modes (k = 22). One-mode studies showed the largest point estimate (Tau = 0.754) but "the differences were not systematically different from zero"; patterns held across models B and C.

"the differences were not systematically different from zero, F (2,22.9) = 1.1, p = 0.345. These patterns were consistent across all three models."

Ganz 2022 (2)¶

Ganz, J. B., Pustejovsky, J. E., Reichle, J., Vannest, K. J., Foster, M., Fuller, M. C., Pierson, L. M., Wattanawongwan, S., Bernal, A. J., Chen, M., Haas, A. N., Skov, R., Smith, S. D., & Yllades, V. (2022). Augmentative and Alternative Communication Intervention Targets for School-Aged Participants with ASD and ID: a Single-Case Systematic Review and Meta-analysis. Review Journal of Autism and Developmental Disorders. doi:10.1007/s40489-022-00326-6

q3 · i? · quant-synthesis · r3

LRR analysis of the same moderator: studies with three or more modes had the largest point estimate (LRR = 1.887), but "Average LRR effect sizes across modes were not statistically distinct"; non-significance held across all three models.

"Average LRR effect sizes across modes were not statistically distinct, F (2, 12.4) = 0.0, p = 0.992"

Discussion¶

Related Claims¶

• AAC interventions yield moderately large average effects on communication outcomes for school-aged participants with ASD and/or ID, with substantial between-study heterogeneity — related
• Communicative function taught (behavioral regulation, joint attention, social interaction, or multiple) does not statistically moderate AAC effects — related
• Type of communication mode shows only a marginal, non-robust moderation of AAC effects, with aided AAC descriptively outperforming manual signs/gestures — related
• Aided versus unaided AAC does not statistically moderate AAC effects, though exclusive aided AAC descriptively yields the largest estimates — related
• Under-reported participant characteristics and implementation factors, plus effect-size metric limitations, explain the scarcity of significant moderator differences — related