Difference in Outcomes of Rectal Foreign Bodies between Males and Females: A Retrospective Analysis of a National Inpatient Database in Japan.
OBJECTIVE
Almost all previous studies related to rectal foreign bodies were based on bizarre and striking cases, resulting in a reporting bias. Our aim was to clarify the clinico-epidemiological findings of rectal foreign body (RFB) in a general population.


METHODS
Using a national administrative database in Japan, we identified patients who underwent in-hospital treatment for rectal foreign bodies from 1 July 2007 to 31 March 2013.


RESULTS
A total of 648 RFB patients with 666 presentations were identified during the study period. The number of male patients was 526 (81.1%). The incidence of a RFB was most frequently seen in males who were in their 60s and in females who were in their 80s. The overall in-hospital mortality was 1.2%. Compared with males, females had a significantly higher proportion of in-hospital death (0.4 vs. 4.8%, p = 0.001), perforation and peritonitis (5.2 vs. 12.8%, p = 0.004), and sepsis (1.1 vs. 4.0%, p = 0.04).


CONCLUSIONS
This study showed the clinico-epidemiological findings of rectal foreign bodies in a general population, and established that there was a low mortality rate. It was also found that females were significantly more likely to have a severe outcome following a RFB than males.
Department of Clinical Epidemiology and Health Economics, School of Public Health, University of Tokyo, Tokyo, Japan.
Hiroyuki
H
Odagiri
Hideo
H
Yasunaga
Hiroki
H
Matsui
Kiyohide
K
Fushimi
Toshiro
T
Iizuka
Mitsuru
M
Kaise
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016208:Databases, Factual; D005260:Female; D005547:Foreign Bodies / Q000150:complications / Q000453:epidemiology*; D017052:Hospital Mortality; D006801:Humans; D015994:Incidence; D007564:Japan / Q000453:epidemiology; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D012007:Rectum; D012189:Retrospective Studies; D017678:Sex Distribution; D012737:Sex Factors; D055815:Young Adult