Key result
Seasonal and diurnal variations in casual blood pressure (systolic 4.1-5.0 mmHg higher in winter) have small genuine effects that lack practical importance in screening for hypertension.
Cross-Sectional (n=1,582)
No
Small diurnal and seasonal variations in casual blood pressure lack practical importance for hypertension screening.
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Small BP variations by season/time do not warrant screening adjustments; supports ignoring them but leaves open prospective outcome validation.
Thulin et al. (1978) conducted a cross-sectional in Blood pressure variations (n=1,582). Casual blood pressure measurement was evaluated on Diurnal and seasonal effects on blood pressure independent of age and sex. Seasonal and diurnal variations in casual blood pressure (systolic 4.1-5.0 mmHg higher in winter) have small genuine effects that lack practical importance in screening for hypertension.
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