When analyzing the results of long term studies, it is evident that the findings are skewed in favor of SSR.
Wiesendanger, K. D., & Birlem, E. D. (1984). The Effectiveness of SSR: An Overview of the Research. Reading Horizons: A Journal of Literacy and Language Arts, 24 (3). Retrieved from https://scholarworks.wmich.edu/reading_horizons/vol24/iss3/9