Table S2.

Study characteristics arranged by strength of association with preeclampsia by highest BP category reported

	QUADAS2 summary	Av age	Av BMI	Ethnicity	MMR of country (per 100 000 live births)	PET definition	PET prevalence	BP device	BP gestation (weeks)	Proportion nulliparous	BP type	BP type – routine or study	Cohort	Total number participants
39	Low	28	NS	S Asian	289	ISSHP 2018	2.5%	Automated	<20	23%	Av of 2 or 3 in 1 visit	Study∗	Unselected	10839
30	Low	30	27	52% H	18	ICD codes	3.5%	NS	<20	41%	=/>2 visits in 30 days	Routine	Unselected	132032
13	Low	31	30	Mixed	6	ACOG 2019	2.9%	Mercury	Multiple	40%	Single	Routine	Unselected	18243
9	High	25% >35	25% >30	56% NHW	18	ACOG 2013	6.3%	NS	<20	43%	=/> 2 visits	Routine	Low risk	18801
14	Low	28	36% >30	Mixed	18	ACOG 2019	3.1%	NS	<20	41%	Single	Routine	Unselected	30000
40	Low	34	23	NR	18	ND	3.4%	NS	<20	54%	Single	Routine	Unselected	377
43	High	30	27	70% NHW	19	ICD codes	6.9%	NS	<20	44%	=/> 2 visits	Routine	Unselected	18162
29	Low	23	NS	S Asian	145	ISSHP 2018	13.0%	Automated	<20	36%	Av 2 or 3 in 1 visit	Study∗	Unselected	6067
52	High	6% >35	9% >30	Asian	36	ACOG 2013	2.1%	Mercury	12	100%	Single ##	Routine	Nulliparous only	58054
8	Low	30	26	51% NHB	15	ACOG 2019	5.4%	Automated	11-14	74%	Single	Study	Unselected	2976
32	High	24.2	24	NR	83		7.8%	Anaeroid	<20	42%	=/> 2, at least 4 hours apart	Routine	Low risk	293
36ˆ	High	39	22	Asian	36	ACOG 2019	1.7%	Mercury	<20		Av of 3 in 1 visit	Study	Low risk	6284
37	High	30	26	Mixed	18	ACOG 2013	30%	NS	<20	35%	Single	Routine	Unselected	252
35Δδφ	High	32	25	Asian	29	ACOG 2013	18.1%	Mercury	<20	36%	Av of 2 in 1 visit	Study	Low risk	838
44	High	NS	10% >30	Asian	29	ISSHP 2018	8.2%	Mercury	<20	78%	Av of 2 in 1 visit	Routine	Low risk	47874
31	High	30	26	52% H	19	ICD codes	3.7%	NS	<20	29%	Single	Routine	Unselected	303689
42δφ	Highδ	21	23	50% NHB	12	ACOG 2003	7.8%	Mercury	(+ <20)	100%	Single	Study	LRN only	2947
45	High	32	21	Asian	97	ACOG 2013	3.0%	Automated	<12	50%	=/> 2 visits	Routine	Low risk	2039
10δφ	High	25	28	58% NHB	12	ACOG 2003	17.9%	Mercury	(+ <20)		Single	Study	High risk	1020
33	High	27	26	61% NHW	14	ACOG 2013	8.3%	Anaeroid	11-12	100%	Single	Study	Nulliparous only	8899
41ˆ	Low	23	NS	African	140	ISSHP 2018	0.9%	Automated	<20	31%	Av of 2 or 3 in 1 visit	Study∗	Unselected	4163

ACOG (American College of Obstetricians and Gynaecologists), Av (average), BP (blood pressure), H (Hispanic), ICD (International Classification of Disease), ISSHP (International Society for Hypertension in Pregnancy), LRN (low risk nulliparous) ND (not defined), NHB (non Hispanic Black), NS (not stated), OPC (observational prospective controlled), ORC (observational retrospective controlled), PET (preeclampsia), S Asian (South Asian), SA (secondary analysis)ˆ includes unpublished data.

Slade. The diagnostic accuracy of American College of Cardiology-American Heart Association blood pressure categories for identification of women and babies at risk. Am J Obstet Gynecol 2023.

^##But used lower if multiple measurements done

^δRandomised trial

^ϕAspirin trial

^∗Study BP values for CLIP trials.