FIGURE 4.

Trends in muscle food category specificity over time for observational studies (A) and randomized controlled trials (B) from a systematic review assessing muscle food categorization and descriptions in chronic disease literature. Results were analyzed via a least squares regression model weighted by total number of muscle food categories assessed per year and adjusted by the yearly average count of muscle food categories per article. *Total number of muscle food categories assessed that year, ^¥number of articles published that year from the final data set. Land-based and water-based muscle food category resolution showed similar trends. Observational studies adjusted and weighted R² = 0.39, coefficient for year = 0.03 (0.01 to 0.05). Randomized controlled trials adjusted and weighted quadratic R² = 0.54, transformed coefficients nonsensical.