The effect of direct payment or a lottery on questionnaire response rates: a randomised controlled trial

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN45481467

Enrollment

1000

Registered

2004-01-23

Start date

1997-09-01

Completion date

Unknown

Last updated

2015-01-13

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

Conditions

Questionnaire response rates Not Applicable N/A

Interventions

1. Direct payment for questionnaire completion 2. Entry into lottery for questionnaire completion

Eligibility

Sex/Gender

Female

Inclusion criteria

Inclusion criteria: Women aged 40 to 65

Exclusion criteria

Exclusion criteria: Not provided at time of registration

Design outcomes

Primary

Measure	Time frame
Not provided at time of registration	—

Secondary

Measure	Time frame
Not provided at time of registration	—

Countries

United Kingdom

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026