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  • Title: A comparison of birth weight and weight/length ratio for gestation as correlates of perinatal morbidity.
    Author: Williams MC, O'Brien WF.
    Journal: J Perinatol; 1997; 17(5):346-50. PubMed ID: 9373837.
    Abstract:
    OBJECTIVE: The purpose was to evaluate a low weight to length ratio as a correlate of perinatal morbidity and mortality. STUDY DESIGN: Data from the Collaborative Perinatal Project for infants of 34 weeks' gestation or more were evaluated. Associations between the weight to length ratio of < 10% (low weight to length) and birth weight of < 10% (small for gestational age) by gestational age and gender, perinatal depression, dysmaturity, cerebral palsy, and neonatal mortality were evaluated. RESULTS: A low weight to length ratio and small for gestational age status were associated with most markers of perinatal morbidity and mortality in term and preterm infants. In infants not small for gestational age, a low weight to length ratio was associated with increased morbidity and mortality (relative risk of 1.9 to 4.2) in term infants, and with perinatal depression (relative risk of 2.9) in preterm infants. Logistic regression found low weight to length ratio was a better independent correlate than small for gestational age status for all markers assessed and found low weight to length ratio was significantly associated with all morbidity and mortality markers in infants not small for gestational age. CONCLUSION: Low weight to length ratio, a marker for asymmetric growth restriction, is correlated with perinatal morbidity, even in infants not small for gestational age.
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