almost significantP = 0.056
Weekly MCCC is significantly associated with lower frailty risk through the fixed-effect model (β = − 0.010; 95% CI: [− 0.014, − 0.006], P < 0.001), while this association is almost significant through the Cox model (HR = 0.86; 95% CI: [0.74, 1.00], P = 0.056).