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. 2023 Oct 4;11:1241401. doi: 10.3389/fpubh.2023.1241401

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Copyright © 2023 Gagliotti, Banchelli, De Paoli, Buttazzi, Narne, Ricchizzi, Schievano, Bellio, Pitter, Tonon, Canziani, Rolli, Tacconelli, Berti, Russo and Moro.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Assessment of risk factors for outpatient care. Results for each cohort were estimated using multivariable Fine-Gray subdistribution hazard models. Confidence intervals for hazard ratios in the two cohorts were calculated with the Wald method based on normal approximation and were two-sided. Pooled results were estimated using random effects meta-analysis with inverse variance weights and maximum likelihood estimator for between-study variance. The models also included the following independent variables: risk of hospitalization and death score (only in the E-R cohort), and Local Health Units (8 in E-R and 9 in Veneto). Additional results for these variables are reported in Supplementary Table 4. Heterogeneity was measured with the tau (τ) statistic and its significance was assessed with the Cochran’s Q test. HR = subdistribution hazard ratio. CI = confidence interval. p = p-value.