A Meta-Analysis of the Long-Term Effects of Phonemic Awareness, Phonics, Fluency, and Reading Comprehension Interventions
Suggate, S. P. · 2016
grade Cmeta-analysisindependentunreplicatednumbers spot-checked
Sample
71 intervention-control comparisons, N=8,161 at posttest
Population
Preschool through school-age; typical and at-risk readers; multiple countries.
Design
Restricted to studies reporting BOTH posttest and follow-up (mean gap 11.2 months). Separates end-of-treatment from ~1yr follow-up effect sizes by intervention type. Aggregates mostly small, published-only trials.
Key findings
The anchor fadeout evidence. Overall reading effects fade 0.37->0.22 over ~11 months; PHONICS and (partly) FLUENCY fade most (phonics 0.33->0.07), while PHONEMIC AWARENESS and COMPREHENSION interventions maintain and even transfer. Interventions given at preschool/kindergarten age persist worst. Durability tracks intervention type and outcome class, not just whether an end-of-treatment effect existed.
Genetic confound
Reading is highly heritable by school age, so only experimental follow-ups are probative; correlational persistence claims are presumptively confounded.
Replication notes
Anchor durability meta. Follow-up values verified against the open-access full text (audit corrected earlier phonics 0.29->0.07 to 0.33->0.07).
DOI / URL
10.1177/0022219414528540
Effects
| Outcome | Metric | Value | Measure | Timing | Vs | Horizon | Class |
|---|---|---|---|---|---|---|---|
| Overall reading (all types pooled) | d | 0.37 posttest -> 0.22 follow-up | mixed | end-of-treatment vs ~11mo | business-as-usual | under-1yr | domain-skill |
| Phonics interventions | d | 0.33 posttest -> 0.07 follow-up (near-zero) | mixed | end-of-treatment vs ~11mo | business-as-usual | under-1yr | domain-skill |
| Phonemic awareness interventions | d | 0.32 -> ~0.29 (maintained) | mixed | ~11mo follow-up | business-as-usual | under-1yr | domain-skill |
| Fluency interventions | d | 0.47 -> 0.28 (partly maintained) | mixed | ~11mo follow-up | business-as-usual | under-1yr | domain-skill |
| Comprehension interventions | d | 0.38 -> 0.46 (maintained/rose; but age-confounded, pub-biased) | mixed | ~11mo follow-up | business-as-usual | under-1yr | domain-skill |
| Preschool/kindergarten-age interventions | d | 0.34 -> 0.12 (poorest persistence by age) | mixed | ~11mo follow-up | business-as-usual | under-1yr | domain-skill |
Cited by
- Background knowledge and vocabulary as drivers of reading comprehensionmoderate supportconf: mediumgc: low
- Reading Recovery and Tier-2 1:1 early-literacy tutoringmixedconf: mediumgc: low
- Reading fluency — guided repeated oral reading, and whether repetition mattersmoderate supportconf: mediumgc: low
- Systematic/explicit phonics vs whole language and balanced literacystrong supportconf: highgc: low