Table 4 Maternal physical, psychological and medical factors influencing EBF rates until 6 months postpartum in Japan.
Total number (n) | Percent EBF to 6 months | Odds ratio | 95% confidence interval | Adjusted odds ratio | 95% confidence interval | |
|---|---|---|---|---|---|---|
Maternal physical factors | ||||||
BMIc (n = 80,435) | ||||||
18.5–25 kg/m2 | 59,392 | 38.5 | Reference | Reference | ||
Less than 18.5 kg/m2 | 13,033 | 38.6 | 1.005 | (0.966–1.045) | 0.983 | (0.938–1.030) |
Greater than 25 kg/m2 | 8010 | 27.0 | 0.592 | (0.562–0.623) | 0.667 | (0.627–0.710) |
Parityc (n = 78,507) | ||||||
Primipara | 33,725 | 31.7 | Reference | Reference | ||
Multipara | 44,782 | 41.8 | 1.550 | (1.505–1.597) | 1.812 | (1.737–1.891) |
Obstetrical complicationsc (n = 79,874) | ||||||
Absent | 68,071 | 37.7 | Reference | Reference | ||
Present | 11,803 | 35.4 | 0.905 | (0.869–0.943) | 1.028 | (0.979–1.079) |
Maternal psychological factors | ||||||
Edinburgh scale scoreb (n = 79,000) | ||||||
Less than 9 | 68,200 | 38.9 | Reference | Reference | ||
Greater than or equal to 9 | 10,800 | 28.3 | 0.622 | (0.595–0.651) | 0.716 | (0.678–0.756) |
Negative emotions towards pregnancya (n = 79,655) | ||||||
Absent | 74,029 | 37.8 | Reference | Reference | ||
Present | 5626 | 32.1 | 0.778 | (0.734–0.824) | 0.906 | (0.844–0.972) |
Medical factors | ||||||
Delivery methodc (n = 80,352) | ||||||
Vaginal delivery | 65,672 | 38.7 | Reference | Reference | ||
Caesarean section | 14,680 | 31.5 | 0.730 | (0.702–0.758) | 1.161 | (1.092–1.233) |
Analgesics during deliveryc (n = 79,069) | ||||||
Absent | 77,177 | 37.6 | Reference | Reference | ||
Present | 1892 | 29.0 | 0.678 | (0.613–0.749) | 0.814 | (0.723–0.916) |
Infertility treatmentsa (n = 79,649) | ||||||
Absent | 72,276 | 38.0 | Reference | Reference | ||
Present | 7373 | 31.3 | 0.744 | (0.706–0.783) | 0.853 | (0.802–0.908) |
