Table 4.

Unadjusted and Adjusted Associations from Regression Models of Breastfeeding Duration and Severe Early Childhood Caries

	Unadjusted Model n = 439		Adjusted Model n = 422		Fully Adjusted Model n = 338
Model Variables	Prevalence Ratio	95% CI	Prevalence Ratio	95% CI	Prevalence Ratio	95% CI
Breastfeeding <6 months (reference)	1		1		1
Breastfeeding 6–11 months	1.45	0.93, 2.23	1.52	0.99, 2.33	1.45	0.83, 2.53
Breastfeeding 12–23 months	1.28	0.80, 2.05	1.44	0.89, 2.32	1.39	0.73, 2.64
Breastfeeding ≥24 months	1.96	1.40, 2.73	2.04	1.45, 2.85	1.85	1.11, 3.08
Clinic allocation (intervention)	0.85	0.65, 1.09	0.89	0.69, 1.15	0.95	0.71, 1.27
Maternal age (years)			0.98	0.96, 1.01	0.98	0.96, 1.01
Maternal education (≤8 years)			1.24	0.93, 1.65	1.35	0.97, 1.89
Maternal smoking (current)			1.49	1.13, 1.95	1.12	0.81, 1.55
Parity (has previous child)			1.18	0.85, 1.63	1.22	0.87, 1.71
Social class (C or lower)			1.09	0.77, 1.54	1.06	0.74, 1.52
Pre-pregnancy BMI ≤18			1.43	1.06, 1.93	1.44	1.03, 2.01
Child age at dental assessment (years)			1.25	0.64, 2.42	0.99	0.46, 2.12
Child sex (male)			1.18	0.91, 1.53	1.34	1.01, 1.77
Length-for-age Zscore at 11–15 months (per SD)					1.05	0.90, 1.23
First-year feeding index (per unit)					1.05	1.01, 1.09
Daily bottles at 5–9 months (1–3)					0.62	0.38, 1.02
Daily bottles at 5–9 months (≥ 4)					0.84	0.47, 1.52
Added sugar in bottle at 5–9 months					1.46	0.94, 2.26
Ever formula fed					0.82	0.59, 1.14
Frequency of fruits at 11–15 months					0.95	0.90, 1.01
Frequency of vegetables at 11–15 months					1.05	0.98, 1.12
Frequency of beans at 11–15 months					1.02	0.94, 1.10
Frequency of meat at 11–15 months					1.04	0.97, 1.12
Frequency of organ meat at 11–15 months					1.17	0.98, 1.39

Abbreviation: CI, confidence interval; BMI, body mass index; SD, standard deviation