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Table 3 Multivariate logistic regression with key exposure birth order and caries increment from age 3- to 7 years

From: Birth order is associated with caries development in young children: a register-based cohort study

Birth orderCaries increment (Δ deft > 0)
Crude ModelModel IModel IIModel IIIModel IV
OR (CI 95%)OR (CI 95%)OR (CI 95%)OR (CI 95%)OR (CI 95%)
First-born1.001.001.001.001.00
Second-born1.21 (1.16–1.26)1.21 (1.16–1.26)1.20 (1.15–1.26)1.18 (1.12–1.23)1.17 (1.12–1.23)
Third-born1.76 (1.67–1.86)1.76 (1.66–1.86)1.71 (1.61–1.81)1.50 (1.42–1.60)1.47 (1.38–1.56)
Fourth-born2.70 (2.46–2.96)2.69 (2.45–2.95)2.43 (2.20–2.68)1.84 (1.67–2.04)1.69 (1.52–1.88)
Fifth- or later-born3.92 (3.44–4.47)3.90 (3.41–4.45)3.55 (3.08–4.08)1.93 (1.68–2.23)1.84 (1.58–2.14)
  1. Crude model = Unadjusted.
  2. Model I = Adjusted only for gender and maternal age.
  3. Model II = Adjusted only for maternal smoking and BMI.
  4. Model III = Adjusted only for sociodemographic factors (parent’s country of birth, maternal educational level, family situation and family income).
  5. Model IV = Adjusted for gender, maternal age, maternal smoking, maternal BMI, and sociodemographic factors.