Table 2.

Matched and unmatched covariates differences

	Matched		Unmatched
	t	p	t	p
Prematurity	− 1.06	0.290	− 7.08	≤ 0.001
Low birth weight	0.23	0.819	− 2.99	0.003
Incubator	− 0.22	0.826	− 2.77	0.006
Breastfeeding length	0.12	0.906	− 10.05	≤ 0.001
Antenatal depression	1.26	0.209	1.05	0.292
Postnatal depression	0.54	0.590	− 0.81	0.417
Child sex	− 0.90	0.369	− 0.76	0.444
Child attendance to educational system	0.09	0.928	− 13.65	≤ 0.001
Maternal age	0.99	0.323	− 2.73	0.006
Single parent	0.15	0.877	− 3.91	≤ 0.001
Maternal education	− 0.09	0.925	− 10.78	≤ 0.001
Maternal occupation	− 0.58	0.563	− 4.03	≤ 0.001
Provisional health system	− 1.18	0.240	1.27	0.203

All significant differences (i.e. p < 0.05) are highlighted in bold