Table 6
Asthma diagnosis by child's age: Odds ratios (ORs) and 95% confidence intervals (95% CIs) from multivariate logistic models

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Characteristics Ages 0 to 1 Ages 2 to 3 Ages 4 to 5
Odds ratio 95% CI Odds ratio 95% Confidence interval Odds ratio 95% Confidence interval
CI = confidence interval
OR = odds ratio
1. p < .05.
2. p < .01.
3. p < .001.
Notes: Characteristics measured when child was aged 0 to 1.
All estimates have been adjusted for the cycle (year) of entry into the NLSCY.
Table source: Statistics Canada, 2008, "The Children of Older First-time Mothers in Canada: Their Health and Development", Children and Youth Research Paper Series, Catalogue number 89-599-M.
Maternal age group
Teenaged (younger than 20) 0.92 (0.31, 2.73) 0.59 (0.24, 1.45) 0.56 (0.22, 1.46)
Young (ages 20 to 24) 0.91 (0.40, 2.05) 0.67 (0.36, 1.24) 0.92 (0.50, 1.71)
Reference (ages 25 to 29; Ref.) 1.00 ... 1.00 ... 1.00 ...
Middle (ages 30 to 34) 1.02 (0.48, 2.18) 1.53 (0.92, 2.54) 1.31 (0.71, 2.43)
Older (ages 35 or older) 1.23 (0.34, 4.42) 0.73 (0.35, 1.52) 0.98 (0.46, 2.06)
Socio-demographic characteristics
Child is male (Ref. Female) 1.02 (0.55, 1.91) 1.48 (0.97, 2.26) 1.952 (1.26, 3.02)
Low-income (Ref. Not low-income) 0.90 (0.45, 1.78) 0.98 (0.51, 1.91) 0.91 (0.42, 1.96)
High school graduate or less
(Ref. More than high school education)
1.05 (0.56, 1.97) 0.88 (0.51, 1.52) 1.27 (0.72, 2.25)
Single-parent household
(Ref. Dual-parent household)
2.561 (1.10, 5.98) 2.711 (1.18, 6.23) 1.94 (0.70, 5.38)
Other characteristics
Duration of breastfeeding
None (Ref.) 1.00 ... 1.00 ... 1.00 ...
6 months or less 0.85 (0.37, 1.97) 0.79 (0.43, 1.45) 0.78 (0.42, 1.44)
More than 6 months 0.71 (0.30, 1.69) 0.64 (0.34, 1.21) 0.71 (0.35, 1.44)
Birth term and weight
Not preterm (Ref.) 1.00 ... 1.00 ... 1.00 ...
Preterm, not low birth weight 2.70 (0.97, 7.51) 1.28 (0.56, 2.94) 0.93 (0.29, 2.96)
Preterm, low birth weight 2.17 (0.71, 6.63) 1.06 (0.22, 5.05) 1.59 (0.39, 6.52)
Mother has asthma 4.633 (2.55, 8.40) 2.833 (1.67, 4.79) 3.793 (2.12, 6.77)