Table 1.

Clinical variables.

Variable	N	%
Sex
Male	31	51.7
Female	28	46.7
Indeterminate	1	1.7
Gestational age
< 37 weeks	51	85.0
≥ 37 weeks	9	15.0
Birth weight
< 1000 g	34	56.7
1000-1500 g	15	25.0
> 1500 g	11	18.3
Type of delivery
Vaginal	22	36.7
Cesarean	38	63.3
Clinical condition
Hyaline membrane disease	41	68.3
Sepsis	25	41.7
Pneumonia	14	23.3
Bronchial dysplasia	11	18.3
Transitory tachypnea	10	16.7
Meconium aspiration syndrome	4	6.7