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The researchers used historical
in their analysis of parenthood and ageing. They analysed the
data on 14,836 women. Researchers examined DNA data and blood
, then modelled the effects of reproduction on women's rates of ageing and
. Ms Hukkanen postulated that having a smaller number of
could have favourable effects on a mother's health. One
is a possible lower risk of breast and ovarian
. However, the "wear and tear" and physical demands of multiple childbirths can negate this lowered
. Another factor that could increase longevity is the
social support a mother receives from the
for having children.
