Acute respiratory illnesses in the first 18 months of life

• Published in: Revista Panamericana de Salud Pública
• Main Authors: Ilse M. López Bravo, Haydeé Sepúlveda, Isabel Valdés
• Format: Article in Journal/Newspaper
• Language: English; Spanish; Portuguese
• Published: Pan American Health Organization 1997
• Subjects: Medicine; R; Arctic medicine. Tropical medicine; RC955-962; Public aspects of medicine; RA1-1270; Arctic; Ari
• Online Access: https://doi.org/10.1590/s1020-49891997000100003; https://doaj.org/article/05eef3e87c7948d0b48ccc8d1ba9ec38

To help assess the causes and frequency of acute respiratory illnesses (ARI) during the first 18 months of life in Chile, a cohort of 437 children born in good health between May 1991 and April 1992 was followed at an urban health clinic in northern Santiago. Information was obtained from medical checkups performed at the clinic, from emergency health care services, from private physicians, and from interviews with each child's mother when the child was enrolled in the study and when it was 6, 12, and 18 months old. Followup was completed for 379 (87%) of the children. ARI accounted for 67% of all 3762 episodes of illness recorded for these children in the 18-month study period, 1384 (55%) of the ARI episodes affecting the upper respiratory tract and the remaining 1144 (45%) affecting the lower. The overall rate of ARI observed was 33 episodes per 100 child-months of observation. The incidences of upper, lower, and total ARI episodes decreased significantly in the third six months of life. A statistically significant association was found between upper ARI ( > or = 2 episodes) and maternal smoking ( > or = 5 cigarettes per day), but no significant associations were found with any of the other risk factors studied. However, lower ARI ( > or = 2 episodes) was significantly associated with maternal schooling (<8 years), a family history of atopic allergy, and substandard housing conditions; and lower ARI ( > or = 4 episodes) was significantly associated with these factors and also with the existence of one or more siblings, birth in a cold season, limited breast-feeding (<4 months), and low socioeconomic status. Significant associations were found between obstructive bronchitis episodes and most of the risk factors studied (gender, siblings, season of birth, duration of breast-feeding, maternal schooling, smoking, use of polluting fuels in the home, and a family history of atopic allergy); similarly, significant associations were found between the occurrence of pneumonia and many risk factors ...