Table 2.
Risk factors associated with breastfeeding cessation in the first 17 weeks after delivery.
| Risk Factors | Prognostic Index | ||||||
|---|---|---|---|---|---|---|---|
| Derivation Cohort 1999 | Validation Cohort 2004 | Validation Cohort 2017 | |||||
| Log HR | 95% CI | Scores | Log HR | 95% CI | Log HR | 95% CI | |
| Completed Vocational Education | |||||||
| None–short–skilled | 0.32 | −0.04–0.69 | 1 | 0.51 | 0.24–0.79 | 0.24 | 0.00–0.48 |
| Theoretical bachelor–master | ref. | ref. | 0 | ref. | ref. | ref. | ref. |
| Previous breastfeeding experience: | |||||||
| None, primipara | 0.89 | 0.25–1.53 | 3 | 1.02 | 0.62–1.42 | 0.49 | 0.11–0.87 |
| 0–5 weeks | 1.79 | 1.05–2.52 | 6 | 1.49 | 0.96–2.03 | 0.85 | 0.39–1.31 |
| 6–17 weeks | 1.14 | 0.49–1.79 | 4 | 0.77 | 0.33–1.21 | 0.78 | 0.34–1.22 |
| >17 weeks | ref. | ref. | 0 | ref. | ref. | ref. | ref. |
| Self-efficacy with respect to breastfeeding | |||||||
| Uncertain | 0.82 | 0.48–1.17 | 3 | 0.98 | 0.70–1.25 | 1.11 | 0.85–1.38 |
| Certain | ref. | ref. | 0 | ref. | ref. | ref. | ref. |
| Sense of security not knowing the exact amount of milk the baby ingests | |||||||
| Insecure | 0.72 | 0.35–1.08 | 2 | 0.51 | 0.24–0.77 | 0.71 | 0.46–97 |
| Secure | ref. | ref. | 0 | ref. | ref. | ref. | ref. |
Cox regression analysis of data from 391 mothers with complete information in the derivation cohort, and assigned scores included in the breastfeeding score for each category of the four risk factors. For comparison, the corresponding Cox regression analyses of data from 633 and 579 mothers in the validation cohorts.