Sir.—Kraybill et al1 presented a nearly complete data set about very-low-birth-weight (VLBW) (501 to 1500 g) infants born in North Carolina in 1984, including the incidence of chronic lung disease (CLD). We have been accumulating similar data about all VLBW infants in our North Central Perinatal Region (NCPR) in Illinois for the period from 1985 through 1986. This data set includes information about 219 NCPR infants cared for in our center, 61 infants cared for in surrounding centers, and 19 infants who never received center care.2 We present herein a brief comparison between the North Carolina and NCPR experiences (Table). We also offer some comments pertinent to our common topic. A more complete report of our experience is in preparation.
The 19 NCPR infants not transferred to centers—infants who would have been missed by the system of Kraybill et al—are a mixed group. Only nine infants "were