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Table 1 Description of the five groups of smokers given free nicotine patches

From: Does the number of free nicotine patches given to smokers calling a quitline influence quit rates: results from a quasi-experimental study

Amount of free nicotine patches sent to smokers Group 1
2-week supply
Group 2
4-week supply
Group 3
6-week supply contingent upon first 2-weeks of use
Group 4
6-week supply
Group 5
8-week supply
Number of Participants 19,852 38,667 19,859 35,334 2,000
Survey Sample Size 490 588 731 1,386 707
Program Dates 11/2004 - 8/2005 9/2005 - 5/2006 11/2004 - 5/2006 4/2003 - 5/2003 4/2004 - 6/2004
Mean duration of follow-up for the initial follow-up survey (months) 3.14 3.12 3.15 5.51 7.24
Response rate initial follow-up survey* 69.0% 69.0% 45.2% 63.7% 68.7%
Number of eligible subjects who completed the initial follow-up survey 338 406 332 880 486
Mean duration of follow-up for the 12-month follow-up survey (months) 12.85 12.08 12.03 14.00 12.50
Response rate 12-month follow-up survey** 68.6% 56.9% 50.0% 65.6% 73.3%
Number of eligible subjects who completed both surveys 232 231 166 577 356
Overall response rate 12-month follow-up survey*** 47.3% 39.3% 22.7% 41.6% 50.3%
  1. *Initial follow-up response rate defined as the number of completed interviews among those considered eligible for follow-up (defined as those with working phone numbers).
  2. **12-month response rate defined as the number of completed interviews among those who completed the initial follow-up survey
  3. ***Overall response rate defined as the number of completed interviews among those initially eligible for follow-up