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Table 4 Rates of developmental impairment

From: Neurodevelopmental outcome of extremely low birth weight infants at 24 months corrected age: a comparison between Griffiths and Bayley Scales

  n (%) n (%)
Group 1 Bayley-II Griffiths
Cognitive-Language abilitiesa within normal limits 40 (43.5) 54 (58.7)
Cognitive-Language abilitiesa mild impairment 21 (22.8) 20 (21.7)
Cognitive-Language abilitiesa severe impairment 31 (33.7) 18 (19.6)
Motor abilitiesb within normal limits 53 (57.6) 66 (71.7)
Motor abilitiesb mild impairment 13 (14.1) 14 (15.2)
Motor abilitiesb severe impairment 26 (28.3) 12 (13.0)
Group 2 Bayley-III Griffiths
Cognitive-Language abilitiesc within normal limits 78 (76.5) 74 (72.6)
Cognitive-Language abilitiesc mild impairment 16 (15.7) 17 (16.7)
Cognitive-Language abilitiesc severe impairment 8 (7.8) 11 (10.8)
Motor abilitiesd within normal limits 84 (82.4) 77 (75.5)
Motor abilitiesd mild impairment 7 (6.9) 15 (14.7)
Motor abilitiesd severe impairment 11 (10.8) 10 (9.8)
  n (%) n (%) n (%)
  Bayley-III Griffiths
Group 2-for single subscales   
Cognitive abilitiese within normal limits 87 (85.3) 74 (72.5)  
Cognitive abilitiese mild impairment 8 (7.8) 16 (15.7)  
Cognitive abilitiese severe impairment 7 (6.9) 12 (11.8)  
Language abilitiesf within normal limits 75 (73.5) 75 (73.5)  
Language abilitiesf mild impairment 17 (16.7) 12 (11.8)  
Language abilitiesf severe impairment 10 (9.8) 15 (14.7)  
Motor abilitiesg within normal limits 84 (82.4) 73 (71.6) 84 (82.4)
Motor abilitiesg mild impairment 7 (6.9) 8 (7.8) 9 (8.8)
Motor abilitiesg severe impairment 11 (10.8) 21 (20.6) 9 (8.8)
  1. aBayley-II MDI vs Griffiths Hearing and Speech-Performance Quotients (mean)
  2. bBayley-II PDI vs Griffiths Locomotor-Eye and Hand Coordination Quotients (mean)
  3. cBayley-III Cognitive-Language Composite Scores (mean) vs Griffiths Hearing and Speech-Performance Quotients (mean)
  4. dBayley-III Motor Composite Score vs Griffiths Locomotor-Eye and Hand Coordination Quotients (mean)
  5. eBayley-III Cognitive Composite Score vs Griffiths Performance Quotient
  6. fBayley-III Language Composite Score vs Griffiths Hearing and Speech Quotient
  7. gBayley-III Motor Composite Score vs Griffiths Locomotor Quotient vs Eye and Hand Coordination Quotient