Multiariate mixed models incorporating a propensity score to account for imbalance among cohorts were used to estimate drug effects on mortality with associated 95% confidence interals (95%CI).

• 运用多变量混合摸型，加上说明不同队列间不均衡性的倾向评分，使用95%25可信区间估计药物作用对死亡率的影响。