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Volume 16, Number 10—October 2010

Letter

Underlying Medical Conditions and Hospitalization for Pandemic (H1N1) 2009, Japan

Taro TomizukaComments to Author , Yoshihiro Takayama, Tokuaki Shobayashi, Yasumasa Fukushima, and Yasuhiro Suzuki
Author affiliations: Author affiliations: National Institute of Public Health, Saitama, Japan (T. Tomizuka, Y. Suzuki); Ministry of Health, Labour and Welfare, Tokyo, Japan (T. Tomizuka, Y. Takayama, T. Shobayashi, Y. Fukushima, Y. Suzuki); Tokyo Medical and Dental University, Tokyo (T. Tomizuka)

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Table

Age-specific incidence and risk for hospitalization with laboratory-confirmed pandemic (H1N1) 2009 virus infection, Japan, July 28–December 14, 2009*

Patient
characteristic Underlying medical conditions†
No underlying medical conditions‡
RR AR
No. (%) patients Incidence/100,000§ No. (%) patients Incidence/100,000§
Age group, y
0–4 648 (22.1) 195.2 2,285 (77.9) 45.2 4.3 150.0
5–9 1,848 (32.6) 814.1 3,822 (67.4) 69.4 11.7 744.7
10–14 763 (35.2) 573.7 1,406 (64.8) 24.0 23.9 549.6
15–19 173 (38.9) 219.0 272 (61.1) 4.5 48.4 214.5
20–29 110 (43.8) 53.9 141 (56.2) 1.0 54.9 52.9
30–39 105 (49.8) 28.5 106 (50.2) 0.6 48.4 27.9
40–49 125 (61.6) 21.6 78 (38.4) 0.5 43.5 21.1
50–59 176 (76.9) 12.8 53 (23.1) 0.3 38.3 12.5
60–69 148 (77.5) 6.7 43 (22.5) 0.3 24.0 6.5
>70
324 (81.0)
8.2

76 (19.0)
0.5
17.9
7.8
Gender
M 2,857 (35.3) NA 5,236 (64.7) NA
F
1,563 (33.9)
NA

3,046 (66.1)
NA


*RR, relative risk for hospitalization; AR, attributable risk for hospitalization; NA, not available. Medical conditions defined as chronic respiratory diseases, chronic cardiovascular diseases, chronic renal diseases, chronic liver diseases, neurologic diseases, hematologic diseases, diabetes, and immunosuppression (including malignant neoplasm) and chronic childhood diseases.
†n = 4,420 (43.8%); 83 patients died.
‡n = 8,282 (65.2%); 27 patients died.
§Incidence = no. case-patients with pandemic (H1N1) 2009 virus infection and a particular medical condition/total population having the same medical condition (e.g., population 0–4 years of age with medical condition).
¶p value for difference in gender was 0.11, obtained by χ2 test (2-sided) for testing the null hypothesis.

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