Table 1

Comparison of selected characteristics of study subjects and children lost to follow up, Montreal, Canada, 1993–1995

Study subjects
(n = 1824)
Children lost to follow up (n = 931)p
Male (%)50.050.10.98
Mean age (SD) (years)10.5 (0.8)10.6 (0.9)0.02
Mean no (SD) persons/household 4.6 (1.5) 4.6 (1.7)0.90
Two-parent family (%)73.469.40.03
Born in Canada (%)
Subject64.553.10.00
 Mother27.624.30.07
 Father23.322.10.49
Family origin (%)0.02
 Europe22.518.8
 Central America/Caribbean21.719.8
 Canada20.819.5
 Asia14.719.0
 Arabic-speaking countries 5.2 6.4
 South America 4.6 4.5
 Other10.611.8
Employed (%)
Father84.383.00.41
 Mother66.659.00.00
Smoke (%)
Subject21.120.60.77
 Mother25.425.60.91
 Father45.747.10.48
 Sibling(s)10.812.30.24
 Friends26.127.60.40