Sensitivity analyses across different maximum lag periods (lag 0, 0-1 d, 0-3 d, 0-7 d, 0-14 d, 0-21 d, and 0-28 d) revealed distinct temporal patterns: heat effects were strongest at immediate exposure (lag 0: RR: 1.09; 95% CI: 1.04-1.13, particularly pronounced in northern China [RR: 1.14; 95% CI: 1.08-1.20]) and diminished rapidly thereafter, becoming borderline significant within 0 to 1 days (RR: 1.04; 95% CI: 1.00-1.08), and approaching the null by lag 0 to 3 days (RR: 1.01; 95% CI: 1.00-1.01).
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Nonoptimal Temperature Is Associated With Higher Atrial Fibrillation Hospitalizations in China: A Nationwide Case-Crossover Study.
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