Poisson regression was used to test for an overall trend across the time period and tested if trends differed between April 2019 to March 2021 (Period 1)) and April 2021 to March 2023 (Period 2: after lockdown restrictions).
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Child mortality in England after national lockdowns for COVID-19: An analysis of childhood deaths, 2019-2023.
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While the profile for deaths from Underlying Disease did vary by age groups ( p < 0.001), most age categories showed a reduction in Period 1, followed by an increase in Period 2; although the reduction in 16–17-year-old CYP in Period 1 did not reach statistical significance (Period 1, IRR 0.83 (95% CI 0.63–1.09); Period 2, 1.38 (95% CI 1.08–1.76)).