Table 2. Characteristics of patients infected with oseltamivir-resistant and -susceptible A(H1N1)pdm09 viruses, United States, October 1, 2013–April 30, 2014*.

Characteristic	Patients with oseltamivir-resistant infections, n = 49†	Patients with oseltamivir-susceptible infections, n = 93†	p value	OR (95% CI)
Median age, y (IQR)	25 (14–53)	24 (18–46)	0.86	NA
Male sex	22/49 (45)	37/92 (40)	0.59	1.21 (0.59–2.46)
White race	32/47 (68)	64/88 (73)	0.84	0.73 (0.37–1.89)
Exposure to oseltamivir before specimen collection	15/49 (31)	9/93 (10)	0.002	4.12 (1.65–10.31)
Outpatients	2/32 (6.3)	1/65 (1.5)	0.21	4.27 (0.37–48.9)
Hospitalized patients	13/17 (76)	8/27 (30)	0.003	7.72 (1.92–31.06)
Exposure to others in household receiving antiviral drugs before patient’s illness	5/33 (15)	4/62 (6)	0.16	2.64 (0.63–11.07)
Any underlying medical conditions	25/49 (51)	50/93 (54)	0.8	0.85 (0.39–1.86)
Chronic pulmonary disease	5/49 (10)	7/93 (8)	0.59	1.2 (0.28–5.07)
Chronic cardiac disease	6/49 (12)	10/93 (11)	0.79	1.38 (0.39–4.83)
Diabetes mellitus	6/49 (12)	8/93 (9)	0.49	1.82 (0.53–6.26)
Immunosuppressive conditions‡	8/49 (16)	6/93 (7)	0.07	3.2 (0.1–10.3)
Other§	9/49 (18)	23/93 (25)	0.39	0.66 (0.27–1.61)
Hospitalized during influenza illness	17/49 (35)	27/92 (29)	0.51	1.51 (0.67–3.43)
Patient died	7/47 (15)	6/93 (6)	0.1	2.8 (0.86–9.14)
Others in the household were ill before patient’s illness	12/32 (38)	21/65 (32)	0.61	1.2 (0.47–3.05)

*OR, odds ratio adjusted for age group; IQR, interquartile range; NA, not applicable.
†Values are no./total (%) unless otherwise indicated.
‡Long history of steroids treatment, HIV/AIDS, solid organ transplant, lupus, solid tumor malignancy, hypothyroidism, leukemia, and pituitary condition.
§Morbid obesity, chronic liver disease, neurologic disorders, chronic kidney disease, seizure, epilepsy, and depression.