Table 1 Summary of CATI and diary characteristics and data handling prior to statistical analysis

Database design A$

$5000

$2360

Duration

15-20 min*

Not applicable

Target number

500

200

Order of administration

First

Second (always Post CATI)

Recruitment strategy

Electoral records and introductory letter

$40 incentive (voucher)

Time period under investigation

Immediate past week (in detail) and up to one year prior

7-day period only

Data entry onto ACCESS database

Immediate (as telephone interview was conducted)

Manual entry

Actions prior to interview/diary administration excluding initial mail-out and associated activities

   - Questionnaire design

   - Print diary cards

   - ACCESS database design

   - Design and print diary instructions

   - Compile diary cards; pack and send*

   - Follow-up phone call to check diary pack receipt*

   - ACCESS database design

Actions subsequent to interview/diary completion

   - Check data entry immediately following interview*

   - Check diary cards for completion/legibility*

   - Tally number of uses recorded on cards*

   - Transfer data including tallies from diary card to ACCESS database*

   - Check 10-25% data transferral to database*

Estimated number of hours labour per completed CATI/diary (for * activities)

30 min

1 hr 25 min