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Etiological Subgroups of Small-for-Gestational-Age: Differential Neurodevelopmental Outcomes
Xiuhong Li1,2, Rina D Eiden3, Leonard H Epstein2
1Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, Guangdong 510080, China.
Insights
Children born small-for-gestational-age (SGA) with multiple births or singleton SGA with smoking and inadequate weight gain show poorer 5-year cognitive outcomes. These findings highlight critical risk factors impacting neurodevelopment in SGA populations.
Area of Science:
- Pediatric Neurodevelopment
- Public Health
- Perinatal Epidemiology
Background:
- Neurodevelopmental outcomes in children born small-for-gestational-age (SGA) exhibit significant variability.
- Understanding the etiological factors contributing to these variations is crucial for targeted interventions.
Purpose of the Study:
- To prospectively compare 5-year neurodevelopmental outcomes across different etiological subgroups of small-for-gestational-age (SGA) children.
- To identify specific prenatal risk factors associated with poorer cognitive development in SGA populations.
Main Methods:
- Utilized data from the U.S. Early Childhood Longitudinal Study-Birth Cohort (N=1050 SGA children).
- Categorized SGA children into etiological subgroups based on 7 established prenatal risk factors.
- Employed linear regression models to assess 5-year reading, math, gross motor, and fine motor scores, adjusting for socio-demographic confounders.
Main Results:
- Multiple-birth SGA subgroups demonstrated lower mean reading and math scores compared to singleton SGA subgroups.
- Cognitive disadvantages in multiple-birth SGA subgroups were pronounced in those without ovulation stimulation.
- Singleton SGA subgroups with co-occurring maternal smoking and inadequate gestational weight gain (GWG) showed significantly lower reading and math scores.
Conclusions:
- Multiple-birth SGA and singleton SGA with combined smoking and inadequate GWG are associated with poorer cognitive development up to age 5.
- These findings underscore the importance of considering multiple risk factors when assessing neurodevelopmental trajectories in SGA children.
- Intervention strategies may need to be tailored to specific etiological subgroups of SGA infants to improve long-term outcomes.
Objectives:
It remains unclear why substantial variations in neurodevelopmental outcomes exist within small-for-gestational-age (SGA) children. We prospectively compared 5-y neurodevelopmental outcomes across SGA etiological subgroups.
Methods:
Children born SGA (N = 1050) from U.S. Early Childhood Longitudinal Study-Birth Cohort (2001-2007) was divided into etiological subgroups by each of 7 well-established prenatal risk factors. We fit linear regression models to compare 5-y reading, math, gross motor and fine motor scores across SGA subgroups, adjusting for socio-demographic confounders.
Results:
Compared to singleton SGA subgroup, multiple-birth SGA subgroup had lower mean reading (adjusted mean difference, -4.08 [95% confidence interval, -6.10, -2.06]) and math (-2.22 [-3.61, -0.84]) scores. These disadvantages in reading and math existed only among multiple-birth SGA subgroup without ovulation stimulation (reading, -4.50 [-6.64, -2.36]; math, -2.91 [-4.37, -1.44]), but not among those with ovulation stimulation (reading, -2.33 [-6.24, 1.57]; math 0.63 [-1.86, 3.12]). Compared to singleton SGA subgroup without maternal smoking and inadequate gestational weight gain, singleton SGA subgroup with co-occurrence of maternal smoking and inadequate gestational weight gain (GWG) had lower mean reading (-4.81 [-8.50, -1.12]) and math (-2.95 [-5.51, -0.38]) scores. These differences were not mediated by Apgar score.
Conclusions:
Multiple-birth SGA subgroups (vs. singleton SGA) or singleton SGA subgroup with co-occurrence of smoking and inadequate GWG (vs. singleton SGA subgroup without maternal smoking and inadequate gestational weight gain) have poorer cognitive development up to 5 y.
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