Because of the need to measure the iq of people of varying ages, newer iq tests base their evaluation of iq on

Newer IQ test base their evaluation of IQ on deviation IQ scores  from the mean of the normal distribution. Deviation Intelligence quotient is used to measure the intelligence of a person. Deviation IQ scores are more accurate than the original way of measuring the person’s intelligence. 

i dont know but thats a great qusestion

answer; i do believe that its(gestation,suction-aspiration or vacuum aspiration;