Effect of prize draw incentive on the response rate to a postal survey of obstetricians and gynaecologists: a randomised controlled trial

ISRCTN	ISRCTN32823119
DOI	https://doi.org/10.1186/ISRCTN32823119
Protocol serial number	N/A
Sponsor	Birmingham Women's Hospital (UK)
Funder	Royal College of Obstetrics and Gynaecology (UK) - Endometriosis Millennium Fund

Prospectively registered

Protocol

Statistical analysis plan

Results

Individual participant data

Plain English summary of protocol

Not provided at time of registration

Dr Thomas Justin Clark
Scientific

Birmingham Women's Hospital
Birmingham
B15 2TG
United Kingdom

Phone	+44 (0)121 4721377
Email	justin.clark@bwhct.nhs.uk

Primary study design	Interventional
Study design	Randomised controlled trial
Secondary study design	Randomised controlled trial
Scientific title
Study objectives	Not provided at time of registration
Ethics approval(s)	Not provided at time of registration
Health condition(s) or problem(s) studied	Epidemiology/Response rates
Intervention	Non-monetary incentive versus no incentive.
Intervention type	Other
Primary outcome measure(s)	Not provided at time of registration
Key secondary outcome measure(s)	Not provided at time of registration
Completion date	01/01/2003

Participant type(s)	Patient
Age group	Not Specified
Sex	Not Specified
Target sample size at registration	1410
Key inclusion criteria	Gynaecologists
Key exclusion criteria	Not provided at time of registration
Date of first enrolment	01/01/2002
Date of final enrolment	01/01/2003

Birmingham Women's Hospital

Birmingham
B15 2TG
United Kingdom

Individual participant data (IPD) Intention to share	No
IPD sharing plan summary	Not provided at time of registration
IPD sharing plan

Output type	Details	Date created	Date added	Peer reviewed?	Patient-facing?
Results article	Results	28/06/2004		Yes	No