Table 4.

Infant Demographic Characteristics and Medical History

Mean (std dev) gestational age at birth	28.24 (2.62) weeks
Range	23 – 36 weeks
Mean (std dev) post-conceptional age at exam	32.82 (2.84) weeks
Range	27–40.5 weeks
Mean (std dev) birth weight	1161 (352) grams
Range	480–1918 grams
Mean (std dev) current weight	1652.5 (515) grams
Range	570 – 3226 grams
Gender	27 male (54%)
	23 female (46%)
Race/ethnicity	African American - 18 (36%)
	White – 24 (48%)
	Hispanic – 6 (12%)
	Biracial – 2 (4%)
Neonatal Medical Index
Korner AF, Stevenson DK, Kraemer HC, et al. Prediction of the development of low birth weight preterm infants by a new neonatal medical index. J Dev Behav Pediatr 1993;14:106–11.
Grade 1 – well infant	Grade I - 0
Grade II – Assisted ventilation <48 hours	Grade II – 7 (14%)
Grade III – Assisted ventilation 3–14 days*	Grade III – 10 (20%)
Grade IV – Assisted ventilation 15–28 days*	Grade IV – 15 (30%)
Grade V – Assisted ventilation > 29 days*	Grade V – 18 (36%)

^*and/or intraventricular hemorrhage, major illness, major surgery, low birth weight