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Volume 18, Number 5—May 2012

CME ACTIVITY

Risk Factors for Intestinal Invasive Amebiasis in Japan, 2003–2009

Naoyoshi NagataComments to Author , Takuro Shimbo, Junichi Akiyama, Ryo Nakashima, So Nishimura, Tomoyuki Yada, Koji Watanabe, Shinichi Oka, and Naomi Uemura
Author affiliations: National Center for Global Health and Medicine, Tokyo, Japan (N. Nagata, T. Shimbo, J. Akiyama, R. Nakashima, K. Watanabe, S. Oka); Kohnodai Hospital, Chiba, Japan (S. Nishimura, T. Yada, N. Uemura)

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Table 1

Characteristics and risk factors for 10,930 patients with amebic colitis, Japan, 2003–2009*

Characteristic All, n = 10,930 Amebic colitis, n = 54 No amebic colitis, n = 10,876 Odds ratio (95% CI)
Median age (IQR) 64 (54–73) 41 (36–52) 65 (54–73) NA
Age, y
>50 8,875 (81.2) 15 (27.7) 8,860 (81.5) Referent
<50 2,055 (18.8) 39 (72.2) 2,016 (18.5) 11.4 (6.1–22.4)
Sex
F 4,522 (41.4) 2 (3.7) 4,520 (39.1) Referent
M 6,408 (58.6) 52 (96.3) 6,356 (58.4) 18.5 (4.9–156.7)
HIV infection
Negative 10,682 (97.7) 23 (42.5) 10,659 (98.0) Referent
Positive 248 (2.3) 31 (57.4) 217 (2.0) 66.2 (36.6–120.7)
HBV infection
Negative 10,746 (98.3) 47 (87.0) 10,699 (84.0) Referent
Positive 184 (1.7) 7 (13.0) 177 (1.6) 9.0 (3.4–20.4)
Syphilis
Negative 10,664 (97.6) 37 (68.5) 10,627 (97.7) Referent
Positive 266 (2.4) 17 (31.5) 249 (2.3) 19.6 (10.2–36.2)

*Values are no. (%) except as indicated. IQR, interquartile range; NA, not applicable; HBV, hepatitis B virus. p values for all comparisons were <0.05, by Mann-Whitney U test.

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