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Table 1 Socio-demographic characteristics of children who were breastfed and children who were not

From: Protective effect of breastfeeding with regard to children’s behavioral and cognitive problems

  Breastfeeding (N = 522) Non-breastfeeding (N = 352) t or X 2 p
Age, mean (SD) 9.07 (0.70) 9.02 (0.72) 0.99 0.323
Male, n (%) 312 (59.8) 197 (56.0) 1.27 0.260
Region    4.56 0.102
Urban 222 (42.5) 129 (36.6)   
Industrial 218 (41.8) 151 (42.9)   
Rural 82 (15.7) 72 (20.5)   
Yearly family income    1.81 0.179
>$25,000 315 (60.9) 229 (65.4)   
<$25,000 202 (39.1) 121 (34.6)   0.683
Maternal IQ 108.11 (11.38) 106.38 (11.89) 2.10 0.036
Child’s IQ 112.41 (13.95) 108.47 (14.16) 4.07 < 0.001