Table 3.

Association between duration of breastfeeding and prevalence of dental caries at 3 years of age (n = 486).

Duration	Full breastfeeding				Any breastfeeding
	n	Prevalence of caries (%)	Unadjusted RR (95% CI)	Adjusted RR† (95% CI)	n	Prevalence of caries (%)	Unadjusted RR (95% CI)	Adjusted RR‡ (95% CI)
< 6 months	219	66.2	1.0	1.0	205	66.8	1.0	1.0
6–11 months	166	56.6	0.86 (0.73, 1.01)	0.84 (0.73, 0.98)	129	51.9	0.78 (0.64, 0.94)	0.93 (0.77, 1.12)
12–17 months	75	54.7	0.83 (0.66, 1.04)	0.78 (0.63, 0.96)	64	53.1	0.79 (0.62, 1.02)	1.1 (0.85, 1.43)
≥ 18 months	26	50	0.76 (0.51, 1.12)	0.72 (0.50, 1.03)	88	62.5	0.94 (0.77, 1.13)	1.45 (1.31, 1.60)
p value		0.10 §				0.03 §

N, sample size; RR, relative risk; CI, confidence interval.

^†Adjusted for age and education of the main caregiver, frequency of drinking water after milk feeding at baseline, visible plaque at baseline, and sugar consumption between meals at 36 months.

^‡Adjusted for education of main caregiver, age when other-milk feeding was started, frequency of sleeping while milk feeding at baseline, and sugar consumption between meals at 36 months.

^§Pearson Chi-square test.

Boldface indicates statistical significance.