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Fig. 3 | BMC Medicine

Fig. 3

From: Socioeconomic inequalities in blood pressure: co-ordinated analysis of 147,775 participants from repeated birth cohort and cross-sectional datasets, 1989 to 2016

Fig. 3

Estimated differences in systolic and diastolic blood pressure in the lowest versus highest education attainment (Slope Index of Inequality): quantile regression estimates at different quantiles of the outcome distribution (95% CI). Coefficients are interpreted analogously to linear regression: for example, Q50 shows the median difference in BP comparing the lowest with highest education attainment. An SII of zero (horizontal line) indicates equity in BP levels. Underlying SBP and DBP levels obtained by adding a constant of 10 and 5 mmHg to those using antihypertensive medication, respectively. The quantiles of the BP distribution corresponding to the hypertension thresholds calculated by estimating the proportion of participants with BP values below 140/90 mmHg. Q5 estimate for DBP in birth cohorts: the estimate and its 95% CI were not obtained since the analytical model did not converge (due to insufficient outcome variance at that quantile)

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