Table 2.
Crude and adjusted relative risk for full mother's own milk feeding at 36 weeks' postmenstrual age.
| Unadjusted RR (95% CI) | p | Adjusted RR (95% CI) | p | |
|---|---|---|---|---|
| Milk quantity variables | ||||
| Lactogenesis II achieved at Day 4 | 2.71 (1.49–4.92) | 0.001 | 2.85 (1.53–5.33) | 0.001 |
| Day 4 yield (per 100 g) | 1.11 (1.04–1.19) | 0.001 | 1.10 (1.03–1.17) | 0.004 |
| Day 14 yield (per 100 g) | 1.07 (1.01–1.13) | 0.02 | 1.06 (1.00–1.12) | 0.03 |
| Day 21 yield (per 100 g) | 1.06 (1.01–1.12) | 0.01 | 1.06 (1.01–1.12) | 0.01 |
| Day 14 yield ≥500 g | 1.75 (1.25–2.44) | 0.001 | 1.64 (1.17–2.29) | 0.004 |
| Day 21 yield ≥500 g | 1.64 (1.19–2.26) | 0.003 | 1.61 (1.19–2.19) | 0.002 |
| Day 14 yield ≥750 g | 1.34 (1.01–1.78) | 0.04 | 1.24 (0.94–1.64) | 0.13 |
| Day 21 yield ≥750 g | 1.46 (1.14–1.88) | 0.003 | 1.50 (1.15–1.96) | 0.003 |
| Milk expression variables | ||||
| Day 4 frequency (sessions per day) | 1.02 (0.96–1.09) | 0.53 | ||
| Day 14 frequency (sessions per day) | 1.02 (0.93–1.11) | 0.68 | ||
| Day 21 frequency (sessions per day) | 1.05 (0.97–1.14) | 0.26 | ||
| Baseline variables (perinatal) | ||||
| Multiple birth | 1.00 (0.68–1.46) | 0.99 | ||
| Caesarean birtha | 0.83 (0.63–1.07) | 0.15 | ||
| Primiparous | 0.99 (0.75–1.30) | 0.94 | ||
| Infant/s ventilated at baselinea | 0.69 (0.49–0.98) | 0.04 | ||
| Gestational age at birth (per week) | 1.04 (0.98–1.10) | 0.23 | ||
| Baseline intention to fullly breastmilk feeda | 1.32 (0.92–1.91) | 0.14 | ||
| Presence of partnera | 1.90 (0.86–4.21) | 0.11 | ||
| Baseline variables (demographic) | ||||
| Maternal age (per 10 years) | 0.86 (0.67–1.12) | 0.26 | ||
| Left full time education >18 years | 1.15 (0.82–1.59) | 0.42 | ||
| Ethnic background | ||||
| White | 1 | |||
| Asian | 1.24 (0.92–1.68) | 0.15 | ||
| Black | 0.79 (0.49–1.27) | 0.33 | ||
| Index of multiple deprivation quintile | ||||
| 5 (least deprived) | 1 | |||
| 4 | 1.27 (0.86–1.87) | 0.24 | ||
| 3 | 1.21 (0.80–1.83) | 0.36 | ||
| 2 | 0.83 (0.49–1.41) | 0.50 | ||
| 1 (most deprived) | 1.05 (0.66–1.69) | 0.83 |
Abbreviations: MOM, mother's own milk; RR, relative risk.
a
Adjustment variables. Adjusted analysis also included the randomised allocation. Each adjusted relative risk is the result of a separate model, all of which were adjusted for the same covariates.