Table 3.
Unadjusted and adjusted OR with 95% CIs for associations between duration of breast feeding and dental caries between the ages of 30 and 66 months (nbaseline=43 113)
| Unadjusted model | Adjusted model* | |
|---|---|---|
| OR (95% CI) | OR (95% CI) | |
| At 30 months (n=39 631) | ||
| Exclusively formula fed (ncase=140/2264: 6.2%) | 1.00 (reference) | 1.00 (reference) |
| 1–2 months breast feeding (ncase=449/7474: 6.0%) | 0.97 (0.80 to 1.18) | 0.93 (0.75 to 1.15) |
| 3–5 months breast feeding (ncase=413/7823: 5.3%) | 0.85 (0.69 to 1.03) | 0.90 (0.72 to 1.11) |
| 6–7 months breast feeding (ncase=971/13 140: 7.4%) | 1.21 (1.01 to 1.45) | 1.39 (1.14 to 1.70) |
| Exclusively breast feeding (ncase=864/8930: 9.7%) | 1.63 (1.35 to 1.96) | 1.78 (1.45 to 2.17) |
| At 42 months (n=38 486) | ||
| Exclusively formula fed (ncase=399/2190: 18.2%) | 1.00 (reference) | 1.00 (reference) |
| 1–2 months breast feeding (ncase=1230/7176: 17.1%) | 0.93 (0.82 to 1.05) | 0.92 (0.80 to 1.05) |
| 3–5 months breast feeding (ncase=1191/7547: 15.8%) | 0.84 (0.74 to 0.95) | 0.90 (0.78 to 1.03) |
| 6–7 months breast feeding (ncase=2332/12 852: 18.1%) | 1.00 (0.89 to 1.12) | 1.13 (0.99 to 1.28) |
| Exclusively breast feeding (ncase=1797/8721: 20.6%) | 1.17 (1.03 to 1.31) | 1.26 (1.11 to 1.44) |
| At 54 months (n=36 881) | ||
| Exclusively formula fed (ncase=575/2066: 27.8%) | 1.00 (reference) | 1.00 (reference) |
| 1–2 months breast feeding (ncase=1863/6810: 27.4%) | 0.98 (0.88 to 1.09) | 0.96 (0.85 to 1.08) |
| 3–5 months breast feeding (ncase=1809/7217: 25.1%) | 0.87 (0.78 to 0.97) | 0.93 (0.83 to 1.05) |
| 6–7 months breast feeding (ncase=3280/12 381: 26.5%) | 0.94 (0.84 to 1.04) | 1.03 (0.92 to 1.15) |
| Exclusively breast feeding (ncase=2428/8407: 28.9%) | 1.05 (0.95 to 1.17) | 1.10 (0.98 to 1.24) |
| At 66 months (n=35 754) | ||
| Exclusively formula fed (ncase=743/1985: 37.4%) | 1.00 (reference) | 1.00 (reference) |
| 1–2 months breast feeding (ncase=2429/6542: 37.1%) | 0.99 (0.89 to 1.10) | 1.00 (0.90 to 1.12) |
| 3–5 months breast feeding (ncase=2467/7008: 35.2%) | 0.91 (0.82 to 1.01) | 0.98 (0.88 to 1.10) |
| 6–7 months breast feeding (ncase=4357/12 053: 36.2%) | 0.95 (0.86 to 1.04) | 1.07 (0.96 to 1.19) |
| Exclusively breast feeding (ncase=3042/8166: 37.3%) | 0.99 (0.90 to 1.10) | 1.06 (0.95 to 1.18) |
*Adjusted for birth weight, sex, parity, maternal age at delivery, maternal educational attainment, maternal smoking status, marital status at delivery, family, and region of birth and residence.