Survey 1 | Survey 2 | Survey 3 | |
---|---|---|---|
Topic under survey | Frequency of gastroenteritis on the island of Ireland | Cardiovascular health promotion: attitudes and behaviours in one Irish health board region | Attitudes, perceptions and knowledge of the population of on the island of Ireland to blood transfusion |
Data collection period | Dec 2000 – Nov 2001 | Sept – Oct 2003 | July 2004 – Jan 2005 |
Data collection duration | 12 months | 6 weeks | 7 months |
Region | ROI†, NI‡ | Health Board Area in ROI | ROI, NI |
Telephone number sourcing | Hundred-bank method | Telecom Eireann National Directory Database 2003 | Hundred-bank method |
Household randomisation | Next birth-date | First adult contact | Next birth-date |
Attempts to make contact | Up to 4 calls | 1 call | Up to 4 calls |
Method of survey | Telephone to paper | CATI* | CATI* |
Length of questionnaire | 10 minutes | 15–20 minutes | 10–12 minutes |
Age of respondents | Over 12 years | Over 18 years | Over 16 years |
Schedule of interviews | Weekday evenings and all day Saturday | All day during week and Saturday | Weekday evenings and all day Saturday |
Completed sample size | 9,600 | 1,500 | 4,216 |
Total numbers generated/extracted | 22,281 | 75,893 | 55,982 |
Contact attempts | 45,603 | 6,893 | 32,786 |