Table 1

Summary of studies on normal values in preterm infants

Reference No of preterm infants Mean gestation (completed weeks) Type of feeds Ventilated Nursing position Reflux index (%)
Eweret al 6 1932Enteral (3–4 hourly)NoNot stated11.91-150
Changet al 7 2032Enteral (3 hourly)NoSupine2.03 (2.31)
Pradeauxet al 8 4231ParenteralYesSupine3.5 (3.3)
Newell et al 9 35281-151 MixedMixedProne or lateral4.5 (1.0)
Ng and Quak 10 21301-152 Enteral (1–3 hourly)NoNot stated0.7 (1.1)
  • Reflux index values are mean (SD).

  • 1-150 No SD or range given.

  • 1-151 Median.

  • 1-152 Postconceptual age.