highly significantp < 0.001
The interaction term for frailty and the diaphragm was highly significant (OR = 4.23, 95% CI: 2.37–7.54, p < 0.001), which further demonstrated supra‐additive synergy confirmed by additive interaction metrics (RERI = 1.94, AP = 0.46, SI = 2.31; all p < 0.05).