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Table 1 Characteristics of Manitoba birth cohorts (1978–1982, 1984–1987) and study sample

From: Adolescent outcomes and opportunities in a Canadian province: looking at siblings and neighbors

Variable Format Birth cohort members Siblings in families with at least one same-sex pair Study sample of same-sex sibling pairs*
Place of Residence and Age     
Winnipeg Percent 47.7 40.9 39.5
Age at Jan 1, 2000 Mean (SD) 16.8 (3.02) 16.9 (2.85) 16.8 (2.83)
Family Variables     
Maternal age at first birth Mean (SD) 23.2 (4.55) 22.7 (4.24) 22.9 (4.25)
Number of residential moves between child’s age 8 and 17.5 Mean (SD) 0.87 (1.45) 0.84 (1.49) 0.79 (1.40)
Birth order Mean (SD) 2.02 (1.16) 2.35 (1.36) 2.35 (1.35)
Number of children in family Mean (SD) 3.05 (1.55) 3.76 (1.80) 3.63 (1.74)
Mother married at birth of child Percent 81.5 84.7 87.1
Months in which family received income assistance between child’s age 8 and 17.5 Mean (SD) 5.07 (19.11) 4.98 (18.96) 4.43 (17.89)
Continuous Outcomes     
Language Arts Index (scaled logit) Mean (SD) 0.00 (1.00) -0.08 (1.03) -0.04 (1.01)
Health Status
(ADG Morbidity Score) (age 12–17)
Mean (SD) 9.69 (6.45) 9.08 (6.26) 9.11 (6.24)
Hospital and Physician Costs (age 12–17, C$1993) Mean (SD) 1,158 (4,661) 1,164 (5,315) 1,137 (5,091)
Binary Outcomes     
Not in Grade 12 at Appropriate Age Percent 28.7 32.4 30.6
Teenage Pregnancy (females to age 19) Percent 13.1 14.4 13.5
Received Income Assistance (age 18–19) Percent 5.7 5.8 5.3
Number of Boys   54,056 20,391 15,660
Number of Girls   51,382 18,649 14,012
Number of Families   71,126 16,060 14,502
  1. * 334 families contributed a sibling pair of both sexes, so the total number of pairs used in the sibling/neighborhood analysis was 14,836.
  2. The calculations for "maternal age at first birth", "number of children in family", and "birth order" were based on files which go back to 1970 for the mother. This leads to a slight overestimate of maternal age at first birth and a slight underestimate of the other two variables (since a few children will have been born before 1970). Twins were excluded from birth cohorts and samples. Birth cohort members included those born in and remaining in the province between birth and age 17.5.