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Table 3 Intraclass correlation coefficients (95% CI) between self-reported Blood Pressure* and directly measured blood pressure §

From: Validation of self reported diagnosis of hypertension in a cohort of university graduates in Spain

  Systolic BP Diastolic BP
Total 0.35 (0.09–0.55) 0.35 (0.16–0.51)
   Men 0.36 (0.01–0.62) 0.45 (0.20–0.64)
   Women 0.30 (0.01–0.54) 0.24 (-0.07–0.51)
   ≤ 55 years 0.29 (0.02–0.52) 0.23 (-0.04–0.47)
   >55 years 0.27 (-0.03–0.53) 0.41 (0.12–0.63)
  1. BP: blood pressure. CI: confidence interval.
  2. * Seven categories for systolic BP (from <100 to >150 mmHg) and 7 categories for diastolic BP (<60 to >130) were offered for participants' choice in the questionnaire. We assigned to each category its middle point (95 to 155 mmHg for systolic and 55 to 135 mmHg for diastolic BP) in order to compute the correlation coefficients.
  3. § The average of two measurements taken 5 minutes apart.