Psychiatric disorders in low birthweight young adults. Prevalence and association with assessments at 11 years.

OBJECTIVE: To compare mental health of 136 young adults without neurosensory handicaps born with low birthweight (LBW, birthweight less than 2,000 g) with 132 adults with normal birthweight (NBW). METHOD: A cohort of moderate LBW and NBW young adults were assessed with the Mini-International Neuropsychiatric Interview (MINI) at 19 years and the Children Assessment Schedule (CAS) at 11 years of age. RESULTS: At 19 years of age, 44 out of 136 (32%) LBW young adults were diagnosed with a psychiatric disorder compared to 10% NBW (OR: 2.8; 95% CI: 1.1, 4.5, P=0.02). Among the LBW young adults, affective-, anxiety-, ADHD- and antisocial personality disorders were most common, and nine subjects (20%) had more than one diagnosis. Of 97 LBW subjects examined both at 11 and 19 years of age, 54 (56%) were mentally healthy though out adolescence. This was half as many as for controls (OR: 0.6; 95% CI: 0.3 to 0.9). CONCLUSION: Moderate LBW was associated with an increased risk of psychiatric disorders in young adulthood. Only half of LBW young adults stayed healthy throughout adolescence.

Selectively reduced posterior corpus callosum size in a population-based sample of young adults born with low birth weight.

BACKGROUND AND PURPOSE: Several studies suggest that VLBW is associated with a reduced CC size later in life. We aimed to clarify this in a prospective, controlled study of 19-year-olds, hypothesizing that those with LBWs had smaller subregions of CC than the age-matched controls, even after correcting for brain volume. MATERIALS AND METHODS: One hundred thirteen survivors of LBW (BW <2000 grams) without major handicaps and 100 controls underwent a 3T MR examination of the brain. The cross-sectional area of the CC (total callosal area, and the callosal subregions of the genu, truncus, and posterior third) was measured. Callosal areas were adjusted for head size. RESULTS: The posterior third subregion of the CC was significantly smaller in individuals born with a LBW compared with controls, even after adjusting for size of the forebrain. Individuals who were born with a LBW had a smaller CC (mean area, 553.4 mm(2)) than the controls (mean area, 584.1 mm(2)). Differences in total area, however, did not remain statistically significant after adjusting for FBV. CONCLUSIONS: The uncorrected callosal size in 19-years-olds born with LBW was smaller than that of normal controls. However, after adjusting for FBV, the group difference was restricted to the posterior third. The clinical impact of a smaller posterior part needs further investigation.