Apgar et al., 1958:
Scoring at one minute was done because this
represented the time of most severe depression:
"In the Sloane Hospital the cord has been cut by this
time, and the infant is in the hands of an individual
other than the obstetrician. . .
In many hospitals, such is not the case.  Those
obstetricians who practice slow delivery and delayed
clamping of the cord until pulsations of the umbilical
artery cease still have the infant in the sterile field.  
However, if the obstetrician is reminded of the
passage of time by another observer, he may assign
a score even though the cord is still attached."
Apgar et al. (1958) JAMA 168:1985.
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