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Table 7 Odds Ratios for the Occurrence of Complete Emerged Maxillary Second Molar until 12 Years Per Unit Increases in Birth Weight z-score and Change in Weight-for-age z-score at 0–3 Months and 3–12 Months

From: Association of infant growth with emergence of permanent dentition among 12 year-aged southern Chinese school children

  Model 1a Model 2b Model 3c
OR (95% CI) OR (95% CI) OR (95% CI)
Birth weight z-scored,e
 Complete emerged 1.25 (1.02, 1.52)* 1.29 (1.05, 1.59)*
Change of weight-for-age z-score from birth to 3 monthsd,f
 Complete emerged 0.79 (0.64, 0.98)* 0.75 (0.60, 0.94)* 0.75 (0.60, 0.94)*
Change of weight-for-age z-score from 3 months to 12 monthsd,e,f  
 Complete emerged 1.20 (0.91, 1.58) 1.22 (0.92, 1.61) 1.26 (0.95, 1.68)
  1. aModel 1: unadjusted
  2. bModel 2: adjusted for gestational age (as categorical variable), mode of delivery (natural labour, assisted natural labour, caesarean birth), type of feeding (never breastfed, exclusively breastfed 3 months or partially breastfed, exclusively breastfed for 3 months or more), health status (presence or absence of congenital conditions), highest parental education (≤9th, 10th -11th, ≥ 12th grade), and gender
  3. cModel 3: additionally adjusted for birth weight for age z-score (or baseline weight for the model looking at growth at 3–12 months)
  4. dAssociation with complete permanent tooth emergence at 12 years of age
  5. eOne unit change in birth weight z-score is equivalent to about 500 g in girls and 600 g in boys
  6. fOne unit change in weight z-score at 0–3 months and 3–12 months is equivalent to the distance between adjacent centile lines or 2nd centile, 50th centile, 84th centile, and 98th centile on standard growth charts
  7. *p < 0.05