Statistical Probability Analysis of Storage Temperatures of Domestic Refrigerator as a Risk Factor of Foodborne Illness Outbreak

식중독 발생 위해인자로서 가정용 냉장고의 온도에 대한 확률분포 분석

  • Bahk, Gyung-Jin (Department of Food and Nutrition, Kunsan National University)
  • Received : 2010.01.12
  • Accepted : 2010.02.08
  • Published : 2010.06.30

Abstract

The objective of this study was to present the proper probability distribution model based on the data obtained from surveys on domestic refrigerator food storage temperatures in home. Domestic refrigerator temperatures were determined as risk factors in foodborne disease outbreaks for microbial risk assessment (MRA). The temperature was measured by directly visiting 139 homes using a data logger from May to September of 2009. The overall mean temperature for all the refrigerators in the survey was $3.53{\pm}2.96^{\circ}C$, with 23.6% of the refrigerators measuring above $5^{\circ}C$. Probability distributions were also created using @RISK program based on the measured temperature data. Statistical ranking was determined by the goodness of fit (GOF, i.e., the Kolmogorov-Smirnov (KS) or Anderson-Darling (AD) test) to determine the proper probability distribution model. This result showed that the LogLogistic (-10.407, 13.616, 8.6107) distribution was found to be the most appropriate for the MRA model. The results of this study might be directly used as input variables in exposure evaluation for conducting MRA.

본 연구는 국내에서의 가정내 냉장고 온도에 대한 조사를 수행하여, 현 시점에서의 냉장고에서의 식품보관 온도분포를 추정하였고, 이를 MRA(미생물 위해평가: Microbial risk assessment)의 입력변수로 활용할 수 있도록 적정 확률분포 모델을 제시하였다. 일반적으로 가정내 냉장고에서의 식품 보관온도는 식중독 발생 등에서 있어 중요한 위해인자로 작용하는 것으로 알려져 있다. 조사대상 가구는 총 139가구이었으며, 조사기간은 2009년 5월에서부터 9월까지 data logger를 이용하여 측정하였다. 조사된 냉장고 온도의 평균은 $3.53{\pm}2.96^{\circ}C$로, $5^{\circ}C$ 이상은 23.6%로 나타났다. 수집된 온도자료는 @RISK를 이용, 적합성 검정(GOF: K-S와 AD test)을 수행하여 적정 확률분포모델에 대해 추정하였고, 이중 LogLogistic(-10.407, 13.616, 8.6107)분포 모델이 가장 적절한 국내에서의 가정내 냉장고 식품보관 온도분포 모델로 나타났다. 이 확률분포 모델은 MRA적용에 있어 노출평가에서 입력변수로서 직접적 활용이 가능하다고 할 수 있겠다.

Keywords

References

  1. Oh DH, Rahman SME, Kim JM, Bahk GJ. The statistics probability analysis of pork-cutting processing conditions for microbial risk assessment. J. Fd Hyg. Safety 24: 63-68 (2009)
  2. Brown M, Stringer M. Microbiological Risk Assessment in Food Processing. CRC Press, New York, USA. pp.105-108 (2002)
  3. Bahk GJ. Present status and future prospects of quantitative microbial risk assessment (QMRA) application in Korea. pp. 157-177. In: The 2nd KAST-USNA Symposium-the Science of Food Safety Risk Assessment. August 24, The Korea Chamber of Commerce and Industry, Seoul, Korea. The Korean Academy of Science and Technology, Seoul, Korea (2009)
  4. James SJ, Evans J, James C. A review of the performance of domestic refrigerators. J. Food Eng. 87: 2-10 (2008) https://doi.org/10.1016/j.jfoodeng.2007.03.032
  5. Kennedy J, Jackson V, Blair IS, McDowell DA, Cowan C, Bolton DJ. Food safety knowledge of consumers and the microbiological and temperature status of their refrigerators. J. Food Protect. 68: 142-1430 (2005)
  6. Korean statistic information service (KOSIS). Statistical databasehousehold. http://www.kosis.kr. Accessed Jan. 5, 2010.
  7. Kosa KM, Cates SC, Karns SL, Chambers D. Consumer home refrigeration practice: results of a web-based survey. J. Food Protect. 70: 1640-1649 (2007)
  8. Carrasco E, Perez-Rodriguez F, Valero A, Garcia-Gimeno RM, Zurera G. Survey of temperature and consumption patterns of fresh-cut leafy green salads: risk factors for listeriosis. J. Food Protect. 70: 2407-2412 (2007)
  9. Marklinder IM, Liddblad M, Eriksson LM, Liddqvist R. Home storage temperature and consumer handling of refrigerated foods in Sweden. J. Food Protect. 67: 2570-2577 (2004)
  10. Kennedy J, Jackson V, Blair IS, McDowell DA, Cowan C, Bolton DJ. Food safety knowledge of consumers and the microbiological and temperature status of their refrigerators. J. Food Protect. 68: 142-1430 (2005)