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 modelAdjusted 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.