Table 1.

Baseline characteristics

	Number of participants	Mean(SD) or %
Demographics
Age (years)	201	31 (6)
BMId	198	28 (7)
Ethnicity
White	157	78
Mixed	8	4
Asian or Asian British	18	9
Black or Black British	8	4
Chinese or other	6	3
Unknown/not disclosed	4	2
Eligibilitya
Age ≥ 40	18	9
BMI ≥30	61	31
Multiple pregnancy	35	17
First pregnancy	87	43
Diagnosed with high BP pre-pregnancy	18	9
High BP in previous pregnancy	42	21
Pre-eclampsia in previous pregnancy	24	12
Family history of pre-eclampsia	39	20
Pregnancy interval > 10 yrs	6	3
Renal disease	6	3
Clinic BP at baselineb , d
Systolic	200	118 (10)
Diastolic	200	71 (9)
Education (highest)
Professional qualifications or degree	101	50
School qualifications only	74	37
No formal qualifications	7	4
Unknown	19	9
Other baseline characteristics
Converted STAI scorec	179	34 (11)
Measured BP at home previously	9	25

^aParticipants required one or more eligibility criteria

^bClinic BP at baseline included readings up to 18 weeks pregnancy

^cSix-item version of the State-Trait Anxiety Inventory (STAI-6) was converted pro-rata to range 20–80.

^dThere was missing baseline information from one participant and 2 further participants did not wish to provide BMI data