Walking Attainment in Very Low Birth Weight Infants in Japan

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  • UCHIO Yuu
    Department of Rehabilitation, Tokyo Women's Medical University
  • SHIMA Naoko
    Department of Rehabilitation, Tokyo Women's Medical University
  • NAKAMURA Kaho
    Department of Rehabilitation, Tokyo Women's Medical University
  • NITTA Osamu
    Department of Physical Therapy, Graduate School of Human Health Sciences, Tokyo Metropolitan University
  • IKAI Tetsuo
    Department of Rehabilitation Medicine, Tokyo Women's Medical University

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<p>Objective: To clarify the corrected age of walking attainment in very low birth weight infants by birth weight and gestational age, and determine perinatal factors affecting the delay in walking attainment. Method: This was a longitudinal study. We investigated walking attainment and perinatal factors in 145 very low birth weight infants without neurological abnormalities (mean birth weight 1019.3 ± 299.7 g, gestational age 29.0 ± 2.9 weeks). The study infants were stratified by birth weight (group A: <1,000 g, group B: 1,000 g≤, <1,500 g) and gestational age (group I: <28 weeks, group II: 28 weeks≤, <37 weeks) and were compared using unpaired t-tests. Furthermore, we examined the perinatal factors that affect the delay in walking attainment using multiple regression analysis. Results: Of the walking attainment, infants in Group A were older than those in Group B (50th percentile, 15.8 vs. 14.7 months). Infants in Group I were older than those in Group II (50th percentile, 16.0 vs. 14.8 months). Using multiple regression analysis with walking attainment age as the dependent variable, the duration of mechanical ventilation was found to be significantly related. Conclusion: Very low birth weight infants with light weight and short gestational age have delayed walking attainment, and longer duration of mechanical ventilation increases the risk of delay.</p>

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