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Table 9 Effect of mode on survey costs (2008 prices, in $AU)

From: A randomised trial and economic evaluation of the effect of response mode on response rate, response bias, and item non-response in a survey of doctors

  Simultaneous mixed Sequential mixed Online
Total costs    
AMPCo rental of list $15,830 $15,830 $15,830
Monetary incentives $60,000 $60,000 $60,000
Web survey costs $4,000 $4,000 $4,000
AMPCO handling and postage $97,157 $72,024 $65,361
Printing of letters, further info, fax sheet, envelopes $17,981 $18,470 $18,458
Printing of surveys $21,284 $19,794 $10,995
Data entry $33,684 $16,630 $6,636
Total $249,936 $206,748 $181,280
Incremental cost effectiveness ratios (compared to online mode)    
Response rate 19.71% 20.69% 12.95%
Estimated number of responses 10,677 11,208 7,015
Change in response rate compared to online 6.76% 7.74% -
Change in number of responses compared to online 3,662 4,193 -
Change in total cost compared to online $68,656 $25,468 -
Additional cost per 1% increase in response rate 1 $10,156 $3,290 -
Additional cost per additional response 2 $18.75 $6.07 -
  1. Notes: 1. Δcost/Δ response rate; 2. Δcost/Δ number of responses