Table 1 Summary of relevant variables collected from the TIME study online form.

From: Factors influencing home blood pressure monitor ownership in a large clinical trial

Relevant variables collected in online form

Remarks

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 Date of birth

 Gender

Options: Male, female

 Smoking status

Options: current smoker; ex-smoker; non-smoker, unknown

 Co-morbidities

Options: detailed in Methods

 Prescription of lipid lowering medication

Options: yes; no, unknown

 Number of anti-hypertensive medications

Numeric options provided

 Parents history of hypertension

Options: yes; no, unknown

 Siblings/children history of hypertension

Options: yes; no, unknown

 CV eventa in 1st degree relative age <60

Options: yes; no, unknown

 CV event in 2nd degree relative age <50

Options: yes; no, unknown

 Ownership of HBPM

Options: yes; no

Free-text/string entry

 Height (m)

BMI derived from height and weight.

 Weight (kg)

 Systolic blood pressure (mmHg)

Baseline self-reported blood pressure reading.

 Diastolic blood pressure (mmHg)

 Residential postal-codeb

Individual index of multiple deprivation (IMD) decile scores were derived from their residential postal codes using the respective national guidance on deprivation scoring:

—Scotland (https://www.gov.scot/Topics/Statistics/SIMD)

—England (https://imd-by-postcode.opendatacommunities.org/)

—Wales (https://gov.wales/statistics-and-research/welsh-index-multiple-deprivation)

—Northern Ireland (https://www.nisra.gov.uk/statistics/deprivation/northern-ireland-multiple-deprivation-measure-2017-nimdm2017)

  1. aCardiovascular (CV) event refers to stroke, transient ischaemic attack or myocardial infarction.
  2. bResidential postal codes were held in the secured TIME study database and only derived decile scores were extracted for analysis in this study.