Table 4.
The results of multivariate logistic analyses for selection of formula feeding presented as odds ratios and 95% confidence intervals
| 0 months | 3 months | 6 months | |||||
|---|---|---|---|---|---|---|---|
| First-born | Second-born | First-born | Second-born | First-born | Second-born | ||
| Birth year | 1968–1984 (reference: 1985–2003) | 3.29 (2.57–4.21) | 3.79 (2.96–4.86) | 2.61 (2.16–3.14) | 2.70 (2.23–3.27) | 2.24 (1.82–2.76) | 2.30 (1.87–2.82) |
| Birthweight | <2,000 g (reference: ≥2,000 g) | Not selected | Not selected | – | – | – | – |
| Maternal age | ≥35 years (reference: <35 years) | 1.54 (1.08–2.20) | 1.51 (1.05–2.15) | – | 1.34 (1.02–1.77) | – | – |
| Gestational age | <37 weeks (reference: ≥37 weeks) | 1.50 (1.14–1.97) | Not selected | 1.28 (1.06–1.56) | Not selected | 1.36 (1.10–1.67) | 1.30 (1.06–1.61) |
| Sex | Male (reference: female) | not selected | – | – | – | – | – |
| Zygosity | Monozygotic (reference: dizygotic) | – | – | – | – | Not selected | – |
| Presentation | Non-vertex (reference: vertex) | – | Not selected | – | – | – | – |
| Use of incubator | Yes (reference: no) | 1.34 (1.03–1.74) | 1.92 (1.50–2.46) | – | 1.35 (1.12–1.62) | – | Not selected |
| Neonatal asphyxia | Severe or mild (reference: no) | – | Not selected | – | – | – | – |
The comparison group is full or partial breast-feeding