Table 2.

Poisson regression with robust variance estimation to assess the effect of the intervention on maintenance of breastfeeding at 2 years of age

Model	RR (95 % CI)	p
1 – Intervention group	0.87 (0.58–1.30)	0.506
2 – Model 1 + propensity scorea	0.93 (0.62–1.40)	0.722
3 – Model 2 + cohabitation with grandmotherb	0.91 (0.60–1.37)	0.643
4 – Model 3 + child’s ageb	0.90 (0.57–1.43)	0.668
5 – Model 4 + mother’s education levelb	0.88 (0.55–1.40)	0.580

RR Relative risk, 95 % CI 95 % confidence interval

^aVariables covered by the propensity score: maternal age, education level, skin color, and parity; child’s birth weight and type of delivery; and cohabitation between child’s mother and father; all referring to the beginning of the study

^bUpon the latest assessment