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The JACK Trial: Evaluation of an interactive film-based intervention to reduce teenage pregnancy and promote positive sexual health

The JACK Trial: A multi-site cluster randomised trial of an interactive film-based intervention to reduce teenage pregnancy and promote positive sexual health

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
ISRCTN
Registry ID
ISRCTN99459996
Enrollment
7920
Registered
2016-11-23
Start date
2018-02-01
Completion date
Unknown
Last updated
2023-10-09

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Unintended teenage pregnancy Pregnancy and Childbirth Unintended teenage pregnancy

Interventions

If I Were Jack is an evidence-based, theory-informed, user-endorsed intervention designed to meet the much neglected pregnancy education needs of teenage boys and intended to increase both teenage boy

Sponsors

Queen's Univeristy Belfast
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: School inclusion criteria: 1. All post-primary schools in Northern Ireland with more than 30 pupils in the targeted intervention year 2. In Scotland all secondary schools with over 30 pupils in the targeted intervention year in the six Local Authority areas covered by NHS Greater Glasgow and Clyde (NHSGGC) Health Board 3. In Wales, all secondary schools in South and mid-Wales with over 30 pupils in year 10 4. In England all secondary schools with over 30 pupils in year 10 within one hour train time from central London 5. All schools must be able to send e-mail or text messages containing a link to the video to parents of their pupils. Pupil inclusion criteria: All pupils who are entering Year 11 in NI, S3 in Scotland and Year 10 in England and Wales (mean age 14 across all countries) in 2017/18 in eligible schools.

Exclusion criteria

Exclusion criteria: School exclusion critera: Schools with less than 30 pupils in specified year group. Pupil exclusion criteria: 1. Pupils who decline to participate 2. Pupils whose parents have returned opt out forms to the researchers

Design outcomes

Primary

MeasureTime frame
Avoidance of unprotected sex by age 15 is measured using a composite of individual responses to the questions ‘Have you ever had sex without using contraception?’ and ‘The last time you had sex did you use contraception?’ at baseline and 12-14 months later.

Secondary

MeasureTime frame
Secondary outcomes are measured at baseline and 12-14 months later: 1. Knowledge is measured by total score on items selected from the Mathtech Knowledge Inventory and SKATA 2. Comfort Communicating about sex and pregnancy are measured using scores on the Comfort Communicating about Avoiding Unintended Teenage Pregnancy Scale (to parents, peers and professionals) which was adapted items from the Mathtech Behaviour Inventory 3. Intentions to avoid unintended pregnancy is measured using scores on the Intentions to Avoid Unintended Pregnancy Scale 4. Social influences are measured using scores on the Male Role Attitudes Scale and Sexual Socialisation Instrument (peer and parents sub-scales) 5. Beliefs about capabilities are measured with scores on an adapted version of the Sexual Self-Efficacy Scale

Countries

England, Northern Ireland, Scotland, United Kingdom, Wales

Contacts

Public ContactAine Aventin
a.aventin@qub.ac.uk+44 28 90972463

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Mar 5, 2026