Table 1. Number of preterm low-birth-weight infants classified in the ICD-10 (n = 2709).
| ICD-10 codes | Total <2500g | Total <37w | ||||||
|---|---|---|---|---|---|---|---|---|
| Classified by BW | Classified by GA | |||||||
| <1000g | 1000-1500g | 1500-2500g | <28w | 28-32w | 32-37w | |||
| P00-P04 Fetus and newborn affected by maternal factors and by complications of pregnancy, labour and delivery | 5 | 0 | 0 | 5 | 9 | 0 | 0 | 9 |
| P05-P08 Disorders related to length of gestation and fetal growth | 1555 | 148 | 225 | 1182 | 1340 | 124 | 215 | 1001 |
| P10-P15 Birth trauma | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| P20-P29 Respiratory and cardiovascular disorders specific to the perinatal period | 74 | 0 | 2 | 72 | 88 | 0 | 1 | 87 |
| P35-P39 Infections specific to the perinatal period | 8 | 0 | 0 | 8 | 6 | 0 | 0 | 6 |
| P50-P61 Haemorrhagic and haematological disorders of fetus and newborn | 14 | 1 | 0 | 13 | 6 | 1 | 0 | 5 |
| P70-P74 Transitory endocrine and metabolic disorders specific to fetus and newborn | 34 | 0 | 3 | 31 | 31 | 0 | 1 | 30 |
| P75-P78 Digestive system disorders of fetus and newborn | 3 | 0 | 0 | 3 | 5 | 0 | 0 | 5 |
| P80-P83 Conditions involving the integument and temperature regulation of fetus and newborn | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| P90-P96 Other disorders originating in the perinatal period | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 0 |
| Q00-Q07 Congenital malformations of the nervous system | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Q10-Q18 Congenital malformations of eye, ear, face and neck | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 1 |
| Q20-Q28 Congenital malformations of the circulatory system | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Q30-Q34 Congenital malformations of the respiratory system | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Q35-Q37 Cleft lip and cleft palate | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
| Q38-Q45 Other congenital malformations of the digestive system | 1 | 0 | 0 | 1 | 2 | 0 | 0 | 2 |
| Q50-Q56 Congenital malformations of genital organs | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Q60-Q64 Congenital malformations of the urinary system | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Q65-Q79 Congenital malformations and deformations of the musculoskeletal system | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Q80-Q89 Other congenital malformations | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Q90-Q99 Chromosomal abnormalities, not elsewhere classified | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Total | 1697 | 150 | 230 | 1317 | 1489 | 126 | 217 | 1146 |
BW; birth weight, GA; gestational age, According with the World Health Organization classification of BW and GA, the data were collected for sub-stratified by six BW and GA groups: low-birth-weight infant as a BW of <2500g, very low-birth-weight infant as <1500g, extremely low-birth-weight infant as <1000g, and moderate to late preterm infant as GA of <37w, very preterm infant as <32w, extremely preterm infant as <28w, respectively.