Figure 1. Association of Total Protein Intake With 10-Year All-Cause Mortality, Stratified by Chronic Kidney Disease and Age.

Analyses used Cox proportional hazards regression models. Protein intake was modeled as a 3-knot restricted cubic spline. Hazard ratios (HRs) and 95% CIs were plotted for protein intake above the 1st percentile and below the 99th percentile and obtained from models with interaction terms among protein intake, chronic kidney disease, and age. Models were adjusted for cohort, sex, age, living arrangement, previous occupation, educational level, tobacco smoking, light physical activity, moderate-to-vigorous physical activity, body mass index, diabetes, cardiovascular disease, chronic lung disease, musculoskeletal disease, cancer, depression and mood disorders, and intake of energy, monounsaturated fat, sugar, alcohol, and sodium.