Table 2.

Gender distribution of the offspring by birth order

Gender of offspringCases
Controls
Boy (n)/girl (n)% BoyBoy (n)/girl (n)% Boy
Birth order
    1st child3,773/3,63450.919,467/18,19151.7
    2nd child2,678/2,69449.915,315/14,19251.9
    3rd child1,057/99751.56,766/6,23752.0
    4th child312/30250.82,181/2,08351.2
    5th child91/7754.2709/65352.1
    6th and above44/4151.8433/40551.7
All children7,955/7,74550.744,871/41,76151.8