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Table 3 The outcome Y by the number of contact attempts and trial arm

From: An exploration of the missing data mechanism in an Internet based smoking cessation trial

Attempts Participants Responded Of responders % quit
One phone call 217 214 50/214=23.4%
One phone call and an email 925 69 30/69 =43.5%
Two phone calls 134 132 23/132=17.4%
Two phone calls and an email 6 1 0/1=0%
Three phone calls 93 89 16/89=18.0%
Three phone calls and an email 3 0 0/0
Four phone calls 59 57 10/57=17.5%
Four phone calls and an email 4 0 0/0
Five phone calls 48 45 9/45=20.0%
Five phone calls and an email 8 0 0/0
Six phone calls 19 19 1/19=5.3%
Six phone calls and an email 2 1 1/1=100%
Seven phone calls 38 38 5/38=13.2%
Seven phone calls and an email 2 0 0/0
Eight phone calls 17 16 3/16=18.8%
Eight phone calls and an email 5 1 1/1=100%
Nine phone calls 11 10 2/10=20%
Nine phone calls and an email 2 0 0/0
Ten phone calls 19 19 6/19=31.6%
Ten phone calls and an email 146 11 5/11=45.5%
  1. The fraction and percentage of participants who successfully quit smoking (Y=1) are tabulated by the number of contact attempts (telephone calls and email). Participants received up to ten telephone calls and up to one email attempt.