Identification of individual-level clinical factors associated with increased risk of death during heatwaves: a time-stratified case-crossover study using national primary care records in England.

The opposite trend is observed for systolic blood pressure (SBP) categories with a decreasing trend in OR estimates with each increasing category of SBP ( figure 2 ).

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There appears to be evidence of an increasing trend in ORs for diastolic blood pressure (DBP) categories, with ORs increasing from low DBP up to prehypertensive DBP group.

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