<prompt> What is the incidence of chromosomal abnormality per 1000 live bihs -1.63.65.67.6  <response>: The incidence of chromosomal abnormalities is 5.6 per 1000 live bihs of these 2 per 1000 represent sex aneuploidies, 1.7 per 1000 is autosomal aneuploidies and 1.9 per 1000 is chromosomal translocations ref ;page no;82223rd edition of PARK;s textbook of Preventive and Social medicinel medicine 