Table 3.
Association between experience of breastfeeding, duration of breastfeeding and knee osteoarthritis (OA) (n = 3454)
| Factors | Unadjusted | Model 1 | Model 2 |
|---|---|---|---|
| OR (95% CI) | OR (95% CI) | OR (95% CI) | |
| Breastfeeding experience (dichotomized) | |||
| Non-breastfeed | 1 | 1 | 1 |
| Breastfeed ≥1 mth | 2.41 (1.54, 3.77)a | 1.44 (0.92, 2.27) | 1.92 (0.94, 3.92) |
| Breastfeeding duration (categorized) | |||
| None | 1 | 1 | 1 |
| 1–24 mths | 0.93 (0.57, 1.53) | 1.05 (0.65, 1.70) | 1.60 (0.79, 3.23) |
| 25–48 mths | 2.18 (1.35, 3.52)b | 1.67 (1.03, 2.71)c | 2.30 (1.09, 4.86)c |
| ≥ 49 mths | 4.37 (2.76, 6.93)a | 1.69 (1.03, 2.78)c | 2.17 (1.01, 4.64)c |
| p for trend | <.001 | 0.004 | 0.062 |
Model 1 was adjusted by age
Model 2 was adjusted by age, BMI, household income, smoking, alcohol consumption, physical activity, diabetes, hypertension, children, abortion, menopausal status, hormone replacement therapy
OR odds ratio, 95% CI 95% confidence interval
a p < 0.001, b p < 0.01, c p < 0.05