Table 2 Comparison of age indices, seat versus bed groups
Explained deathsUnexplained deathsp Value
Number of cases
    Seat group710
    Bed group92399
Median (IQ range)Median (IQ range)
Gestation (weeks)NS
    Seat group38.0 (38.0–39.8)38.5 (37.0–40.0)
    Bed group39.0 (37.0–40.0)39.0 (38.0–40.0)
Chronological age (weeks)NS
    Seat group15.0 (9.0–22.4)10.6 (5.9–26.6)
    Bed group14.7 (9.7–26.5)13.7 (9.0–17.9)
Postconceptional age (weeks)NS
    Seat group53 (47.5–60.2)47.7 (43.9–63.6)
    Bed group53 (48.3–64.7)52.1 (47.3–57.4)
  • IQ range, interquartile range.