Using linked data from the Swedish Medical Birth Registry and the Nati
onal Service Enrolment Register, long term follow up (to 18-19 years a
ge) was made of 260 surviving singleton boys whose birthweight was les
s than 1500 g from a total of 150 229 boys born between 1973-5. These
boys were shorter and lighter than boys who weighed more at birth, the
y had more visual and hearing impairments, were at much higher risk of
cerebral palsy and other signs of mental impairment, evident as lower
intelligence test scores and shorter schooling. No significant excess
of asthma, back problems, or headaches were found.