TABLE 3

Risk Factors for LRI Readmission

OR (95% CI)P
Age, y
 <1Reference
 1–40.60 (0.57–0.64)<.001
 5–70.44 (0.40–0.49)<.001
 8–110.41 (0.36–0.46)<.001
 12–170.53 (0.47–0.59)<.001
Sex
 GirlReference
 Boy1.11 (1.06–1.16)<.001
CCIa,b
 1: Infectious and parasitic disease1.49 (0.58–3.86).408
 2: Neoplasms2.86 (2.21–3.70)<.001
 3: Endocrine, nutritional, and metabolic diseases and immunity disorders2.18 (1.94–2.46)<.001
 4: Diseases of blood and blood-forming organs1.76 (1.57–1.96)<.001
 5: Mental disorders1.47 (1.29–1.68)<.001
 6: Diseases of the nervous system and sense organs2.45 (2.19–2.75)<.001
 7: Diseases of the circulatory system1.87 (1.63–2.14)<.001
 8: Diseases of the respiratory system1.19 (1.11–1.26)<.001
 9: Diseases of the digestive system2.01 (1.82–2.21)<.001
 10: Diseases of the genitourinary system2.05 (1.47–2.86)<.001
 12: Diseases of the skin and subcutaneous tissue1.57 (1.14–2.17).006
 13: Diseases of the musculoskeletal system1.74 (1.35–2.25)<.001
 14: Congenital anomalies2.16 (1.98–2.36)<.001
 15: Certain conditions originating in the perinatal period1.38 (0.58–3.29).466
 16: Symptoms, signs, and ill-defined conditions1.06 (0.65–1.72).806
 17: Injury and poisoning2.37 (0.45–12.45).308
 18: Factors influencing health status and contact with health services2.80 (2.49–3.14)<.001
CCI count
 0 or 1 body systemsReference
 2 body systems1.00 (0.89–1.12).994
 3 body systems0.75 (0.62–0.90).002
 ≥4 body systems0.38 (0.29–0.50)<.001
  • CI, confidence interval; OR, odds ratio. —, no P value.

  • a The reference group for each CCI variable is no condition in the body system.

  • b We excluded the CCI variable for body system 11, “Complications of pregnancy, childbirth, and the puerperium,” because patients who have a primary diagnosis code for an obstetric condition or any diagnosis or procedure code for delivery are excluded from the cohort.