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. 2019 Mar 8;109(3):535–543. doi: 10.1093/ajcn/nqy341

FIGURE 2.

FIGURE 2

Five-year crude thigh muscle area change by quintile of protein intake in grams per kilogram body weight per day in 1561 older participants of the Health ABC study. Median intakes of protein in grams per kilogram per day were 0.50 for Q1, 0.68 for Q2, 0.85 for Q3, 1.03 for Q4, and 1.39 for Q5. Gray boxes represent the IQR (P25–P75), the black horizontal line within the gray box represents the median value (P50), whiskers display the lowest or highest value that is not an outlier or extreme, open dots represent outliers (>1.5 and ≤3 times the IQR), and asterisks represent extremes (>3 times the IQR). Tests for a linear trend across the quintiles were conducted by using the median value in each quintile as a continuous variable in the linear regression model. Health ABC, Health, Aging, and Body Composition; P, percentile; Q, quintile.