a nonsignificant trendP = .100
Compared to the reference group (sCa ≤ 8.5 mg/dL), patients with sCa >10.5 mg/dL had a significantly elevated mortality risk (HR: 1.642, 95% CI: 1.278–2.109, P < .001), while those with sCa >8.5 to ≤9.5 mg/dL showed a nonsignificant trend toward reduced risk (HR: 0.881, 95% CI: 0.757–1.025, P = .100), and sCa >9.5 to ≤10.5 mg/dL showed no significant association (HR: 1.067, 95% CI: 0.903–1.260, P = .446).