Table 3 Factors tested for association with ETFPT*.

From: Associations of maternal, perinatal and postnatal factors with the eruption timing of the first primary tooth

Potential factors

Description

Maternal factors

Maternal childbearing age (years): (1) < 25; (2) 25–35; (3) > 35

Maternal prepregnancy BMI: (1) Underweight (<18.5 kg/m2); (2) Normal (18.5–23.9 kg/m2); (3) Overweight (24–27.9 kg/m2); (4) Obese (>28.0 kg/m2)

Exposure to secondhand smoke during pregnancy:(1) Yes; (2) No

Parity:(1) Multiparous; (2) Primiparous

Gestational age (weeks): (1) < 37; (2) ≥ 37

Mode of delivery: (1) Caesarean; (2) Vaginal

Perinatal factors

Birth weight (g): (1) < 2500; (2) 2500–4000; (3) > 4000

Child’s sex: (1) Male; (2) Female

Postnatal factors

Feeding model: (1) Breast feeding; (2) Artificial feeding; (3) Mixed feeding

Duration of breast feeding (months): (1) < 6; (2) ≥ 6

  1. *Abbreviations: ETFPT is eruption timing of the first primary tooth, kg is kilograms, m is meters, g is grams.
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