The aim of the study was to evaluate whether mass-mailing of a 12-mont
h wall calendar which focused on child and infant safety and first aid
treatment had any educational effect on lay people. The calendar incl
uded algorithms for removal of a foreign body from the airways and inf
ant and child CPR. The knowledge and skills in these procedures were t
ested in two groups using a previously validated check-list before and
after the introduction of the calendar. One group received the calend
ar by mass mailing, free-of-charge. Six months after calendar distribu
tion the mean result for 52 persons tested was 18% correct, not differ
ent from the 19% correct for 65 persons tested before calendar distrib
ution. The other group received the calendar as part of an internal co
mpany campaign focusing on infant and child safety with a possibility
for borrowing a baby manikin, but with no instruction involved. In thi
s group the mean result improved significantly from 27% precalendar (n
= 57) to 47% (n = 125) (P < 0.001) 1 week after calendar distribution
with a significant reduction to 38% (n = 52) (P = 0.004) 6 months lat
er, still significantly better than precalendar (P = 0.004). Test pers
ons younger than 50 years old scored better than those older than 50 y
ears (39 vs. 22%, P < 0.001), and the test persons scored better if th
ey had been tested previously (44 vs. 35%, P = 0.04) or had practised
with a baby manikin (45 vs. 35%, P = 0.02). Whether the test persons h
ad children 0-8 years old or not, did not affect the results. In concl
usion the calendar had no educational effect when distributed by mail,
but a safety campaign which included distribution of the calendar and
a possibility to borrow a manikin had a positive influence on the fir
st aid skills and knowledge of lay people. Mass mailing of CPR or othe
r first aid material free-of-charge does not seem to further the goal
of increasing the rate and proficiency of bystander interventions to s
ave lives. (C) 1998 Elsevier Science Ireland Ltd.