Cases (177)
N (%)
Comparison group (281)
N (%)
Sign. test
Age (X±SD) 11.9±1.5 11.96±1.6 t=0.13, P=0.9
Sex M 114(64.5) 169(60.1) c2=1.1,P=0.3
F 63(35.5) 112(39.9)
Residence R 156(87.9) 243(86.5) c2=0.24,P=0.6
U 21(12.1) 38(13.5)
Consanguinity 110(44.4) 116(41.3) c2=0.5,P=0.5
Birth order
First 35(19.4) 61(21.7)   c2=2.9,P=0.6
Second 81(46.0) 115(40.9)
Third 31(18.1) 64(22.9)
Fourth
Fifth and more
25(13.7)
5(2.8)
33(11.7)
8(2.8)
Table 1: Socio-demographic data of cases vs. comparison children.