Table 5.

Bayley II MDI and PDI at 18 to 22 Months' Corrected Age in ELBW Infants

Weight<500 g501 to 600 g601 to 700 g701 to 800 g801 to 900 g901 to 1000 gTotal
Chronologic age (mo)23.0 ± 2.6 22.9 ± 1.4 22.9 ± 1.4 22.7 ± 1.6 22.8 ± 1.6 22.5 ± 1.5 22.7 ± 1.5
Range21–3120–2720–2720–2820–3120–2720–31
Corrected age (mo)19.3 ± 2.9 19.4 ± 1.4 19.4 ± 1.4 19.5 ± 1.4 19.7 ± 1.5 19.5 ± 1.4 19.5 ± 1.5
Range18–2818–2318–2318–2518–2418–2318–28
Bayley MDI78.3 ± 20.472.5 ± 16.574.3 ± 16.474.2 ± 17.076.6 ± 16.679.4 ± 18.176.1 ± 17.2
<856/13 (46)65/93 (70)139/192 (72)147/216 (68)176/264 (67)163/279 (58)696/1056 (66)
<704/13 (31)42/93 (45) 78/192 (41) 90/215 (42) 92/264 (35) 86/279 (31)392/1056 (37)
Bayley PDI77.3 ± 22.275.2 ± 18.775.8 ± 18.776.8 ± 18.479.7 ± 18.080.1 ± 17.578.1 ± 18.3
<857/14 (50)60/93 (65)117/190 (62)127/213 (50)134/257 (52)146/275 (53)591/1042 (57)
<705/14 (36)32/93 (34) 67/190 (35) 65/213 (31) 65/213 (25) 63/275 (25)297/1042 (29)
  • Data expressed as mean ± SD or n (%).

  • * Corrected age—22 children were tested after 22 months, 16 at 23 months, 4 at 24 months, 1 at 25 months, and 1 at 28 months. All Bayley scores are age-adjusted.