Charles R. Henderson

Blood lead concentrations < 10 microg/dL and child intelligence at 6 years of age.

Background Few studies provide data directly relevant to the question of whether blood lead concentrations < 10 μg/dL adversely affect children’s cognitive function. Objective We examined the association between blood lead concentrations assessed throughout early childhood and children’s IQ at 6 years of age. Methods Children were followed from 6 months to 6 years of age, with determination of blood lead concentrations at 6, 12, 18, and 24 months, and 3, 4, 5, and 6 years of age. At 6 years of age, intelligence was assessed in 194 children using the Wechsler Preschool and Primary Scale of Intelligence–Revised. We used general linear and semiparametic models to estimate and test the association between blood lead concentration and IQ. Results After adjustment for maternal IQ, HOME scale scores, and other potential confounding factors, lifetime average blood lead concentration (mean = 7.2 μg/dL; median = 6.2 μg/dL) was inversely associated with Full-Scale IQ (p = 0.006) and Performance IQ scores (p = 0.002). Compared with children who had lifetime average blood lead concentrations < 5 μg/dL, children with lifetime average concentrations between 5 and 9.9 μg/dL scored 4.9 points lower on Full-Scale IQ (91.3 vs. 86.4, p = 0.03). Nonlinear modeling of the peak blood lead concentration revealed an inverse association (p = 0.003) between peak blood lead levels and Full-Scale IQ down to 2.1 μg/dL, the lowest observed peak blood lead concentration in our study. Conclusions Evidence from this cohort indicates that children’s intellectual functioning at 6 years of age is impaired by blood lead concentrations well below 10 μg/dL, the Centers for Disease Control and Prevention definition of an elevated blood lead level.

Improving the life-course development of socially disadvantaged mothers: a randomized trial of nurse home visitation.

We evaluated a comprehensive program of prenatal and postpartum nurse home visitation for socially disadvantaged women bearing first children. Eighty-five per cent of the participating women were either teenagers (less than 19 years at registration), unmarried, or of low socioeconomic status. Women were randomly assigned to either nurse home visitation or comparison services (free transportation for prenatal and well-child care and/or sensory and developmental screening for the child). During the first four years after delivery of their first child, in contrast to their counterparts in the comparison group, nurse-visited White women who had not graduated from high school when they registered in the study returned to school more rapidly; nurse-visited, poor, unmarried White women showed an 82 per cent increase in the number of months they were employed, had 43 per cent fewer subsequent pregnancies, and postponed the birth of second children an average of 12 months longer.

Long-term Effects of Prenatal and Infancy Nurse Home Visitation on the Life Course of Youths: 19-Year Follow-up of a Randomized Trial

OBJECTIVE To examine the effect of prenatal and infancy nurse home visitation on the life course development of 19-year-old youths whose mothers participated in the program. DESIGN Randomized trial. SETTING Semirural community in New York. PARTICIPANTS Three hundred ten youths from the 400 families enrolled in the Elmira Nurse-Family Partnership program. Intervention Families received a mean of 9 home visits (range, 0-16) during pregnancy and 23 (range, 0-59) from birth through the childs second birthday. MAIN OUTCOME MEASURES Youth self-reports of educational achievement, reproductive behaviors, welfare use, and criminal involvement. RESULTS Relative to the comparison group, girls in the pregnancy and infancy nurse-visited group were less likely to have been arrested (10% vs 30%; relative risk [RR], 0.33; 95% confidence interval [CI], 0.13-0.82) and convicted (4% vs 20%; 0.20; 0.05-0.85) and had fewer lifetime arrests (mean: 0.10 vs 0.54; incidence RR [IRR], 0.18; 95% CI, 0.06-0.54) and convictions (0.04 vs 0.37; 0.11; 0.02-0.51). Nurse-visited girls born to unmarried and low-income mothers had fewer children (11% vs 30%; RR, 0.35; 95% CI, 0.12-1.02) and less Medicaid use (18% vs 45%; 0.40; 0.18-0.87) than their comparison group counterparts. CONCLUSIONS Prenatal and infancy home visitation reduced the proportion of girls entering the criminal justice system. For girls born to high-risk mothers, there were additional positive program effects consistent with results from earlier phases of this trial. There were few program effects for boys.

Enduring effects of prenatal and infancy home visiting by nurses on children: follow-up of a randomized trial among children at age 12 years.

OBJECTIVE To test the effect of prenatal and infancy home visits by nurses on 12-year-old, firstborn childrens use of substances, behavioral adjustment, and academic achievement. DESIGN Randomized controlled trial. SETTING Public system of obstetric and pediatric care in Memphis, Tennessee. PARTICIPANTS We studied 12-year-old, firstborn children (n = 613) of primarily African American, economically disadvantaged women (743 randomized during pregnancy). INTERVENTION Program of prenatal and infancy home visits by nurses. OUTCOME MEASURES Use of cigarettes, alcohol, and marijuana; internalizing, externalizing, and total behavioral problems; and academic achievement. RESULTS By the time the firstborn child was 12 years of age, those visited by nurses, compared with those in the control group, reported fewer days of having used cigarettes, alcohol, and marijuana during the 30-day period before the 12-year interview (0.03 vs 0.18, P = .02) and were less likely to report having internalizing disorders that met the borderline or clinical threshold (22.1% vs 30.9%, P = .04). Nurse-visited children born to mothers with low psychological resources, compared with their control group counterparts, scored higher on the Peabody Individual Achievement Tests in reading and math (88.78 vs 85.70, P = .009) and, during their first 6 years of education, scored higher on group-administered standardized tests of math and reading achievement (40.52 vs 34.85, P = .02). No statistically significant program effects were found on childrens externalizing or total behavioral problems. CONCLUSIONS Through age 12, the program reduced childrens use of substances and internalizing mental health problems and improved the academic achievement of children born to mothers with low psychological resources.

Effect of prenatal and infancy nurse home visitation on government spending.

A completed series of reports on a randomized trial (N=400) indicated that, in contrast to comparison services, prenatal and infancy nurse home visitation improved a wide range of maternal and child health outcomes among poor, unmarried, and teenaged women bearing first children in a semirural county in upstate New York. Eighty-nine percent of the sample was white, and all analyses focused on this group. In this article, an analysis of the net cost of the home-visitation program from the perspective of government spending is presented. The average per-family cost of the program in 1980 dollars was

Outcomes associated with opioid use in the treatment of chronic noncancer pain in older adults: a systematic review and meta-analysis.

3,246 for the sample as a whole, and

The promise of home visitation: Results of two randomized trials

3,133 for low-income families. Treatment differences in government expenditures for Aid to Families with Dependent Children, Food Stamps, Medicaid, and Child Protective Services, minus tax revenues due to maternal employment (also expressed in 1980 dollars), were conceived as government savings. By the time the children were 4 years of age, government savings were

Low-Level Lead Exposure, Executive Functioning, and Learning in Early Childhood

1,772 (95% confidence interval [CI]: -

Symptom monitoring in childhood asthma: a randomized clinical trial comparing peak expiratory flow rate with symptom monitoring

557,

The impact of the parental illness representation on disease management in childhood asthma.

4,102) for the sample as a whole, and