Table 3

Response rates to repeat mailings of women living in the Seattle area who received their first mailing before July 1999

First mailingSecond mailingThird mailingP
Total reached by mailinga 18,380 15,547 10,753
Total responses (%)b 1,436 (7.8) 816 (5.2) 239 (2.2) <0.001
Number randomized (%)c 46 (3.2) 10 (1.2) 2 (0.8) 0.003
Mailings (costd) needed to randomize 1 participant 401 ($76.60) 3206 ($612.35) 17,046 ($3,255.79) First mailingSecond mailingThird mailingP Total reached by mailinga 18,380 15,547 10,753 Total responses (%)b 1,436 (7.8) 816 (5.2) 239 (2.2) <0.001 Number randomized (%)c 46 (3.2) 10 (1.2) 2 (0.8) 0.003 Mailings (costd) needed to randomize 1 participant 401 ($76.60) 3206 ($612.35) 17,046 ($3,255.79)
a

Number of women mailed minus the number of mailings returned by the post office.

b

Denominator for percentages is the total reached by mailing.

c

Denominator for percentages is the total number of responses.

d

In 1998 dollars, based on the bulk-rate of \$0.191 per mailing when sending 3000 packets at one time.

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