Volume 18, Number 5—May 2012
CME ACTIVITY - Research
Risk Factors for Intestinal Invasive Amebiasis in Japan, 2003–2009
Naoyoshi Nagata
, Takuro Shimbo, Junichi Akiyama, Ryo Nakashima, So Nishimura, Tomoyuki Yada, Koji Watanabe, Shinichi Oka, and Naomi Uemura
, Takuro Shimbo, Junichi Akiyama, Ryo Nakashima, So Nishimura, Tomoyuki Yada, Koji Watanabe, Shinichi Oka, and Naomi Uemura
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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