The s-ex ratio indicates the relation-ship between the num-ber of men and the num-ber of women of a giv-en age.
S-ex ratio is the proport-ional distri-bution of the se-xes in a pop-ulation aggre-gate, expressed as the num-ber of males per 100 fe-males. Se-x ratio means the number of females / 1000 ma-les.
This ratio gives the num-ber of females in 1000 males. This ratio ten-ds to be 1:1. Deviations ha-ve been obser-ved in this trend very of-ten. In human soci-eties, s-ex ratios at birth may be consider-ably skewed by factors such as the age of mot-her at birth.
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