Supporting information.

Table A in S3 Text: Baseline characteristics for women enrolled in the FGLS. Table B in S3 Text: All sites and individual site means (SD) for DBP and SBP of all women. Fig A in S3 Text: Plot to illustrate sensitivity analysis for excluding potential site outliers; SBP and DBP according to gestational age for third, 50th, and 97th centiles. Table C in S3 Text: Smoothed centiles for SBP and DBP according to gestational age for third, 10th, 50th, 90th, and 97th centiles (95% CI). Fig B in S3 Text: Smoothed centiles for SBP and DBP in mmHg; third, 10th, 50th, 90th, and 97th centiles with corresponding 95% confidence intervals. Fig C in S3 Text: Smoothed centiles for SBP and DBP in mmHg excluding women (n = 132) who developed hypertension (systolic BP ≥140 or diastolic BP ≥90); third, 10th, 50th, 90th, and 97th centiles. Fig D in S3 Text: SBP and DBP from 16 weeks’ gestation onwards for quartiles according to baseline blood pressure (third, 10th, 50th, 90th, and 97th centiles). First quartile 76–105/40–64 mmHg; second quartile 106–111/65–70 mmHg; third quartile 112–119/71–75 mmHg; fourth quartile ≥120/76 mmHg). Fig E in S3 Text: Change in systolic and DBP during pregnancy by quartiles of baseline blood pressure at study entry at 9–13⁺⁶ weeks’ gestation. DBP, diastolic blood pressure; FGLS, Fetal Growth Longitudinal Study; SBP, systolic blood pressure; SD, standard deviation; SSD, standardised site difference.

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