Risk factors for hospitalization among adults with asthma: the influence of sociodemographic factors and asthma severity

Table 2 Risk factors for hospitalization over longitudinal follow-up: clinical factors, asthma severity, health status, and health care access

Risk factor	Baseline interview (mean [SD] or n [%])	Risk of hospitalization at 18 months (OR [95% CI])
Asthma severity
Severity-of-asthma score (per 5 points)	11.1 (4.8)	4.7 (2.9–7.7)
Recent hospitalizations for asthma^*	60 (25%)	11.6 (5.3–25.2)
Remote hospitalizations for asthma^†	64 (26%)	0.7 (0.3–1.6)
Other asthma clinical factors
Childhood onset (before 18 years)	117 (48%)	1.0 (0.5–2.0)
Atopic history	199 (82%)	0.5 (0.2–1.1)
Aspirin allergy history	32 (13%)	2.3 (1.0–5.6)
Gastric acid suppression medication (in prior 12 months)	62 (26%)	2.7 (1.3–5.5)
Generic health status
SF-36 Physical component score (per 1 point)	43.1 (12.0)	0.94 (0.91–0.97)
SF-36 Mental component score (per 1 point)	44.3 (9.2)	0.96 (0.93–1.0)
Health care access
Deductable for physician office visits	76 (31%)	1.0 (0.5–2.0)
Reliance on ED for urgent asthma care	39 (16%)	2.5 (1.1–5.5)

Bivariate analysis (n = 242). ED, emergency department. ^*Recent hospitalizations, hospitalization during 12 months prior to baseline interview or 18 months prior to 18-month follow-up interview. ^†Remote hospitalizations, hospitalization more than 12 months prior to baseline interview.

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