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Table 4 Socio-demographic and perinatal profiles of mother–child pairs in the final case and control samples and the initial samples of likely cases and controls invited to participate in GA SEED and assessment of factors associated with inclusion in the final samples

From: Assessment of demographic and perinatal predictors of non-response and impact of non-response on measures of association in a population-based case control study: findings from the Georgia Study to Explore Early Development

Factor % Among final ASD cases who completed study (N = 118) % Among all likely ASD cases invited (N = 422) Adjusted ORa inclusion in final ASD sample (95% CI) % Among final POP controls who completed study (N = 159) % Among all likely POP controls invited (N = 2599) Adjusted ORa inclusion in final POP sample (95% CI)
Child sex female 18.6 23.0 0.7 (0.4–1.2) 51.6 49.7 1.0 (0.8–1.4)
Maternal age > 35 years 26.3 21.1 1.4 (0.8–2.3) 23.3 13.7 1.6 (1.1–2.4)
Previous live births ≥ 1 46.6 52.4 0.8 (0.5–1.2) 52.2 58.7 0.7 (0.5–1.0)
Maternal education > 12 years 56.8 45.5 1.6 (1.0–2.5) 56.6 33.6 2.2 (1.6–3.2)
Maternal race/ethnicity NOT non-Hispanic white 51.7 58.5 0.8 (0.5–1.4) 45.9 61.9 0.7 (0.5–1.0)
Maternal marital status NOT married 61.0 67.5 0.7 (0.4–1.3) 65.4 70.2 1.0 (0.7–1.5)
Preterm delivery (< 37 weeks’ gestation) 16.1 15.9 1.2 (0.6–2.2) 10.7 9.9 1.3 (0.7–2.1)
Cesarean delivery (primary or repeat) 17.8 17.1 0.8 (0.4–1.6) 13.8 13.2 1.0 (0.6–1.6)
Induction/stimulation of labor 18.6 19.1 1.2 (0.6–2.3) 13.8 14.2 0.8 (0.5–1.4)
  1. Data in italics indicate the confidence interval for the effect estimate does not include 1.0
  2. aAdjusted models include all factors listed in the table