Analysis of factors influencing the opinions of fresh fruits and vegetables consumers on food safety
Yıl 2018,
Cilt: 33 Sayı: 1, 14 - 23, 15.02.2018
Özge Can Niyaz
,
Nevin Demirbaş
Öz
The aim of this study was to
determine the factors that influence opinions of fruits and vegetables
consumers’ in Canakkale province in terms of food safety. Data for the study
were collected from 166 consumers, determined by means of Propositional Random
Sampling. Factor Analysis and Binary Logistic Regression Analysis were used to
analyze the data. According to the research, quality problems and the
possibility of physical and chemical fraud in fruits and vegetables in terms of
food safety proved to have a negative impact on consumer opinions towards
fruits and vegetables, whereas locally produced fruits and vegetables affected
the consumer opinions positively.
Kaynakça
- Baker, G. A. 1999. Consumer preferences for food safety attributes in fresh apples: market segments, consumer characteristics and marketing opportunities. Journal of Agricultural Resource and Economic, 24(1):80-97.
- Baker, G. A. 2003. Food safety and fear: factors affecting consumer response to food safety risk. International Food and Agribusiness Management Review, 6(1):1-11.
- Bal, S. H., Göktolga Z. G., Karakacıer, O. 2006. Gıda güvenliği konusunda tüketicilerin bilincinin incelenmesi: Tokat ili örneği. Tarım Ekonomisi Dergisi 12(1): 9-18.
Berdegue, J. A., Balsevich, F., Flores, L., Reradon, T. 2005. Central American supermarkets’ private standards of quality and safety in procurement of fresh fruits and vegetables. Food Policy, 30(3): 254-269.
- Bond, J. K., Thilmany, D., Bond, C. 2009. What influences consumer choice of fresh produce purchase location? Journal of Agricultural and Applied Economics, 41(1): 61-74.
- Bucher, T., Van der Horst, K., Siegrist, M. 2012. The fake food buffet-a new method in nutrition behaviour research. British Journal of Nutrition, 107(10):1553-1560.
Canavari, M., Bazzani, G. M., Spadoni, R., Regazzi, D. 2002. Food safety and organic fruit demand in Italy: a survey. British Food Journal, 104(3/4/4): 220-232.
- Cassady, D., Jetter, K. M., Culp, J. 2007. Is price a barrier to eating more fruits and vegetables for low-income families? Journal of American Dietetic Association, 107(11): 1909-1915.
- Choi, J., Zhao, J. 2014. Consumers’ behaviors when eating out: does eating out change consumers’ intention to eat healthily? British Food Journal, 116(3): 494-509.
- Cronbach, L. J. 1951. Coefficent Alpha and the internal structure of tests. Psichometrika Journal, 16(3): 297-334.
- D’Amato, P. M., Falzon, J. 2014. Why do some consumers prefer organic food? A discourse analytical perspective. Journal of Food Products Marketing, 21(3): 255-273.
- DiStefano, C., Zhu, M., Mindrila, D. 2009. Understanding and using factor scores: considerations for the applied researcher. Pratical Assesment Research and Evaluation, 14(20):1-11.
- Edward, S., Wang, T., Li, Y. L. 2013. The effect of stress and visible health problems on the intent to continue health food consumption. British Journal Food, 117(1): 302-317.
- Ehiri, J. E., Morris, G. P. 2008. Food safety control strategies: A critical review of traditional approaches. International Journal of Environmental Health Research, 4:254-263.
- Elaine, A. I., Chirstopher, A. S. 2007. Licert Scales and data analysis. PreQuest, 40(7): 64-65.
- European Commission (EC). 2014. Rapid alert system for food and feed (RASFF). Annual Report, Belgium.
- Field, A. 2006. Reliability analysis. Research methods II. London, UK.
- Food and Agriculture Organization (FAO). 2003. Assuring food safety and quality: guidelines for strengthening national food control systems. Paper 76. Rome, Italy.
- Food and Agriculture Organization (FAO). 2016. Promotion of Fruits and Vegetables for Health. Report of the Pacific Regional Workshop. Rome, Italy.
- Food and Agriculture Organization (FAO). 2017. Marketin Research and Information Systems. Chapter 7: Sampling in Marketin ResearchCorporate Document Repository. Available from URL: http://www.fao.org/docrep/w3241e/w3241e08.htm [Accessed: 28 March 2017].
- Garaert, P., Verbeke, W., Devlieghere, F., Debevere, J. 2004. Consumer perception and choice of minimally processed vegetables and packaged fruits. Food Quality and Preference, 15(3): 259-270.
- Gıda Güvenliği Hareketi (GGH) 2016. Available from URL: http://www.gidahareketi.org/ [Accessed: 14 December 2016].
- Grunet, K. G. 2005. Food quality and safety: consumer perception and demand. European Review of Agricultural Economics, 32(3):369-361.
- Hadi, A. H. I. A., Selamat, J., Shamsudin, M. N., Radam, A. 2010. Demand for food safety attributes for vegetables in Malaysia. Environment Asia, 3(Special Issue): 160-167.
- Haghiri, M., Hobbs, J. E., McNamara, M. L. 2009. Assessing consumer preferences for organically grown fresh fruit and vegetables in Eastern New Brunswick. International Food and Agribusiness Management Review, 12(4): 81-100.
- Harker, F. R., Gunson, A. F., Jaeger, S. R. 2003. The case for fruit quality: an interpretive review of consumer attitudes and preferences for apples. Postharvest Biology and Technology, 28(3):333-347.
- Hosmer, D. W., Lemeshow, S. 2000. Applied Logistic Regression, 2nd edition. John Wiley, New York, USA.
- İstanbul İhracatçı Birlikleri (IBB). 2014. Yaş meyve raporu 2023. Available from URL: http://www.iib.org.tr/tr/birliklerimizyas-meyve-sebze-ihracatcilari-birligi.html. [Accessed: 14 December 2016].
- Jacxsens, L., Boxstael, S. V., Nanyunja, J., Jordaan, D., Lunin, P., Uyttendaele, M.. 2015. Opinions on fresh produce food safety and quality standards by fresh produce supply chain experts from the Global South and North. Journal of Food Protection, 78(10): 1914-1924.
- Kays, S. J. 1999. Preharvest factors affecting appearance. Proharvest Biology and Technology. 15(3):233-247.
- Krystallis, A., Chryssohoidis, G. 2005. Consumers willingness to pay for organic food: factors that affect it and variation per organic product type. British Food Journal, 107(5): 320-343.
- Liao, P. A., Chang, H. H., Chang, C. Y. 2011. Why is the food traceability system unsuccessful in Taiwan? Empirical evidence from a national survey of fruit and vegetable farmers. Food Policy, 36:686-693.
- Marcolini, C. M., Rosa, M. P., Zafra, E. L. 2013. Designations and consumer perceptions: an experimental study and implications for agricultural policy. British Food Journal, 117(3):1188-1204.
- Niyaz, Ö. C., Demirbaş, N. 2011. Türkiye yaş meyve üretim ve ihracatının son on yıllık döneminin değerlendirilmesi. Tarım Ekonomisi Dergisi, 17:37-45.
- Norman, G. 2010. Likert Scales, levels of measurement and the ‘‘laws’’ of statistics. Advances in Health Sciences Education, 15(5): 625-632.
- Obana, H., Okihashi, M., Akutsu, K., Kitagawa, Y., Hori, S. 2003. Determination of neonicotinoid pesticide residues in vegetables and fruits with solid phase extraction and liquid chromatography mass apectrometry. Journal of Agricultural Food Chemistry, 51: 2501-2505.
- Oger, R., Woods, T. A., Albert, P. J., Allan, D. 2001. Food safety in the U.S. fruit and vegetable indusrty: awareness and management practices of producers in Kentucky. Agricultural Economics Staff Paper, University of Kentucky College of Agriculture, Department of Agricultural Economics. Kentucky, USA.
- Onazaka, Y., Nurse, G., McFadden, D. T. 2010. Local food consumers: how motivations and perceptions translate to buying behavior. Choices, The Magazine of Food, Farm and Resource Issues; A Publication of Agricultural Applied Economics Association, 25(1):1-6.
- Oraman, Y., Unakıtan, G. 2010. Analysis of Factors Influencing Organic Fruit and Vegetable Purchasing in Istanbul, Turkey. Ecology of Food and Nutrition, 49(6):452-466.
- Organization for Economic Co-operation and Development (OECD) 2010. Health at glance: Europe 2010. Available from URL: http://www.oecd.org/. [Accessed: 23 January 2016].
- Özdamar, K. 2013. Paket programlar ile istatistiksel veri analizi. Cilt:2, Nisan Kitap Evi, Eskişehir, Türkiye.
- Safefood. 2007. A review of the fruit and vegetable food chain: consumer focused review of the fruit and vegetable food chain. Safefood, February 2007.
- Sakar, E., Keskin, S., Unver, H. 2011. Using of Factor Analysis scores in Multiple Linear Regression model for prediction of Kernel Weight in Ankara Walnuts. The Journal of Animal and Plant Scince, 21(2):182-185.
- Sayın, C., Özkan, B., Ceylan, R. F. 2011. The role of wholesale markets in the supply chain for fresh fruits and vegetables in Turkey. Acta Hortic, 895: 263-268.
Tabachnick, B. G., Fidell, L. S. 2001. Using multivariate statistics. Boston, USA.
- Turkish Statistical Institute (TSI) 2015. Available from URL: http://www.tuik.gov.tr/Start.do;jsessionid=BJ8nWQGpLghd11f5z6g3dYs6ycQX6rnXCBhZz3Kgv4S1jTLRDH2Z!-1391686050. [Accessed: 23 July 2015].
- Tranmer, M., Elliot, M. 2005. Binary Logistic Regression. Cathie Marsh Center for Census and Survey Research, 1-43, Manchester, UK.
- Trienekens, J., Zuurbier, P. 2008. Quality and safety standarts in the food industry, develeopments and challanges. International Journal of Production Economics, 113:107-122.
- United Nations (UN). 2007. Safety and quality of fresh fruits and vegetables: a training manual for trainers. New York and Geneva.
- United State Depratment of Health and Human Services Food and Drug Administiration (USDHHSFDA). 1998. Guidence for industry: guide to minimize microbial food safety hazards for fresh fruits and vegetables., Center for Food Safety and Applied Nutrition. Washington DC, USA.
- United States of Agriculture Department (USDA). 2008. Price Tends Are Similar for Fruits, Vegetables and Snack Food.. Economic Research Report. Number:55, USA.
- University of Maryland (UM). 2010. Improving the safety and quality of fresh fruits and vegetables: a training manual for trainers. FDA Joint Intsitute for Food Safety and Applied Nutrion. Maryland, USA.
- Weisong, M., Chengcheng, L., Dong, T., Jianying, F. 2015. Chinese consumers’ behavior and preference to table grapes based on a comparative study of 2009 and 2014. British Food Journal, 118(1): 231-246.
- Wilcock, A., Pun, M., Khanona, J., Aung, M. 2004. Consumer attitudes, knowledge and behavior: a review of food safety issues. Trends in Food Sceince and Technology, 15(2): 56-66.
- World Health Organization (WHO). 2011. Five keys to growing safer fruits and vegetables: promoting health by decreasing microbial contamination. Trail Edition for Field Testing.
- World Health Organization (WHO). 2016. Available from URL: http://www.who.int/dietphysicalactivity/fruit/en/. [Accessed: 18 March 2016].
- Yahaya, I., Yamoah, F. A., Adams, F. 2015. Consumer motivation and willingness to pay for safer vegetable in Ghana. British Food Journal, 117(3):1043-1065.
- Yeung R. M. W., Morris, J. 2001. Food safety risk: consumer perception and purchase behavior. British Food Journal, 103(3):170-187.
- Yılmaz H., Demircan, V., Gül, M. 2010. Examing of chemical fertilizer use levels in terms of agricultural environment relations and economic losses in the agricultural farms: the case of Isparta, Turkey. Bulgarian Journal of Agricultural Science, 16(2):143-157.
- Yiridoe, E. K., Bonti-Ankomah, S., Martin, R. C. 2005. Comparison of consumers perceptions and preference toward organic versus conventionally produced foods: A review and update of the literature. Renewable Agriculture and Food Systems, 20(4):193-2005.
- Zhu, M. 2009. Understanding and using Factor scores: considerations for the applied researcher. Pratical Assesment. Research and Evaluation, 14(20):1-11.
Yaş meyve sebze tüketicilerinin gıda güvenliği hakkındaki düşüncelerini etkileyen faktörlerin analizi
Yıl 2018,
Cilt: 33 Sayı: 1, 14 - 23, 15.02.2018
Özge Can Niyaz
,
Nevin Demirbaş
Öz
Bu çalışmanın amacı, Çanakkale ilindeki yaş
meyve ve sebze tüketicilerinin gıda güvenliği ile ilgili görüşlerini etkileyen
faktörlerin belirlenmesidir. Çalışmada kullanılan veriler Oransal Örnekleme
Formülü ile seçilen 166 tüketiciden elde edilmiştir. Verilerin analizinde
Faktör Analizi ve İkili Lojistik Regresyon Analizi kullanılmıştır. Araştırmaya
göre, kalite sorunu ile fiziksel ve kimyasal hileler yapılması ihtimali yaş
meyve ve sebze tüketicilerinin gıda güvenliği açısından düşüncelerini olumsuz
etkilerken, yerel olarak üretilen yaş meyve ve sebzeler ise tüketicilerin gıda
güvenliği hakkındaki görüşlerini olumlu etkilemektedir.
Kaynakça
- Baker, G. A. 1999. Consumer preferences for food safety attributes in fresh apples: market segments, consumer characteristics and marketing opportunities. Journal of Agricultural Resource and Economic, 24(1):80-97.
- Baker, G. A. 2003. Food safety and fear: factors affecting consumer response to food safety risk. International Food and Agribusiness Management Review, 6(1):1-11.
- Bal, S. H., Göktolga Z. G., Karakacıer, O. 2006. Gıda güvenliği konusunda tüketicilerin bilincinin incelenmesi: Tokat ili örneği. Tarım Ekonomisi Dergisi 12(1): 9-18.
Berdegue, J. A., Balsevich, F., Flores, L., Reradon, T. 2005. Central American supermarkets’ private standards of quality and safety in procurement of fresh fruits and vegetables. Food Policy, 30(3): 254-269.
- Bond, J. K., Thilmany, D., Bond, C. 2009. What influences consumer choice of fresh produce purchase location? Journal of Agricultural and Applied Economics, 41(1): 61-74.
- Bucher, T., Van der Horst, K., Siegrist, M. 2012. The fake food buffet-a new method in nutrition behaviour research. British Journal of Nutrition, 107(10):1553-1560.
Canavari, M., Bazzani, G. M., Spadoni, R., Regazzi, D. 2002. Food safety and organic fruit demand in Italy: a survey. British Food Journal, 104(3/4/4): 220-232.
- Cassady, D., Jetter, K. M., Culp, J. 2007. Is price a barrier to eating more fruits and vegetables for low-income families? Journal of American Dietetic Association, 107(11): 1909-1915.
- Choi, J., Zhao, J. 2014. Consumers’ behaviors when eating out: does eating out change consumers’ intention to eat healthily? British Food Journal, 116(3): 494-509.
- Cronbach, L. J. 1951. Coefficent Alpha and the internal structure of tests. Psichometrika Journal, 16(3): 297-334.
- D’Amato, P. M., Falzon, J. 2014. Why do some consumers prefer organic food? A discourse analytical perspective. Journal of Food Products Marketing, 21(3): 255-273.
- DiStefano, C., Zhu, M., Mindrila, D. 2009. Understanding and using factor scores: considerations for the applied researcher. Pratical Assesment Research and Evaluation, 14(20):1-11.
- Edward, S., Wang, T., Li, Y. L. 2013. The effect of stress and visible health problems on the intent to continue health food consumption. British Journal Food, 117(1): 302-317.
- Ehiri, J. E., Morris, G. P. 2008. Food safety control strategies: A critical review of traditional approaches. International Journal of Environmental Health Research, 4:254-263.
- Elaine, A. I., Chirstopher, A. S. 2007. Licert Scales and data analysis. PreQuest, 40(7): 64-65.
- European Commission (EC). 2014. Rapid alert system for food and feed (RASFF). Annual Report, Belgium.
- Field, A. 2006. Reliability analysis. Research methods II. London, UK.
- Food and Agriculture Organization (FAO). 2003. Assuring food safety and quality: guidelines for strengthening national food control systems. Paper 76. Rome, Italy.
- Food and Agriculture Organization (FAO). 2016. Promotion of Fruits and Vegetables for Health. Report of the Pacific Regional Workshop. Rome, Italy.
- Food and Agriculture Organization (FAO). 2017. Marketin Research and Information Systems. Chapter 7: Sampling in Marketin ResearchCorporate Document Repository. Available from URL: http://www.fao.org/docrep/w3241e/w3241e08.htm [Accessed: 28 March 2017].
- Garaert, P., Verbeke, W., Devlieghere, F., Debevere, J. 2004. Consumer perception and choice of minimally processed vegetables and packaged fruits. Food Quality and Preference, 15(3): 259-270.
- Gıda Güvenliği Hareketi (GGH) 2016. Available from URL: http://www.gidahareketi.org/ [Accessed: 14 December 2016].
- Grunet, K. G. 2005. Food quality and safety: consumer perception and demand. European Review of Agricultural Economics, 32(3):369-361.
- Hadi, A. H. I. A., Selamat, J., Shamsudin, M. N., Radam, A. 2010. Demand for food safety attributes for vegetables in Malaysia. Environment Asia, 3(Special Issue): 160-167.
- Haghiri, M., Hobbs, J. E., McNamara, M. L. 2009. Assessing consumer preferences for organically grown fresh fruit and vegetables in Eastern New Brunswick. International Food and Agribusiness Management Review, 12(4): 81-100.
- Harker, F. R., Gunson, A. F., Jaeger, S. R. 2003. The case for fruit quality: an interpretive review of consumer attitudes and preferences for apples. Postharvest Biology and Technology, 28(3):333-347.
- Hosmer, D. W., Lemeshow, S. 2000. Applied Logistic Regression, 2nd edition. John Wiley, New York, USA.
- İstanbul İhracatçı Birlikleri (IBB). 2014. Yaş meyve raporu 2023. Available from URL: http://www.iib.org.tr/tr/birliklerimizyas-meyve-sebze-ihracatcilari-birligi.html. [Accessed: 14 December 2016].
- Jacxsens, L., Boxstael, S. V., Nanyunja, J., Jordaan, D., Lunin, P., Uyttendaele, M.. 2015. Opinions on fresh produce food safety and quality standards by fresh produce supply chain experts from the Global South and North. Journal of Food Protection, 78(10): 1914-1924.
- Kays, S. J. 1999. Preharvest factors affecting appearance. Proharvest Biology and Technology. 15(3):233-247.
- Krystallis, A., Chryssohoidis, G. 2005. Consumers willingness to pay for organic food: factors that affect it and variation per organic product type. British Food Journal, 107(5): 320-343.
- Liao, P. A., Chang, H. H., Chang, C. Y. 2011. Why is the food traceability system unsuccessful in Taiwan? Empirical evidence from a national survey of fruit and vegetable farmers. Food Policy, 36:686-693.
- Marcolini, C. M., Rosa, M. P., Zafra, E. L. 2013. Designations and consumer perceptions: an experimental study and implications for agricultural policy. British Food Journal, 117(3):1188-1204.
- Niyaz, Ö. C., Demirbaş, N. 2011. Türkiye yaş meyve üretim ve ihracatının son on yıllık döneminin değerlendirilmesi. Tarım Ekonomisi Dergisi, 17:37-45.
- Norman, G. 2010. Likert Scales, levels of measurement and the ‘‘laws’’ of statistics. Advances in Health Sciences Education, 15(5): 625-632.
- Obana, H., Okihashi, M., Akutsu, K., Kitagawa, Y., Hori, S. 2003. Determination of neonicotinoid pesticide residues in vegetables and fruits with solid phase extraction and liquid chromatography mass apectrometry. Journal of Agricultural Food Chemistry, 51: 2501-2505.
- Oger, R., Woods, T. A., Albert, P. J., Allan, D. 2001. Food safety in the U.S. fruit and vegetable indusrty: awareness and management practices of producers in Kentucky. Agricultural Economics Staff Paper, University of Kentucky College of Agriculture, Department of Agricultural Economics. Kentucky, USA.
- Onazaka, Y., Nurse, G., McFadden, D. T. 2010. Local food consumers: how motivations and perceptions translate to buying behavior. Choices, The Magazine of Food, Farm and Resource Issues; A Publication of Agricultural Applied Economics Association, 25(1):1-6.
- Oraman, Y., Unakıtan, G. 2010. Analysis of Factors Influencing Organic Fruit and Vegetable Purchasing in Istanbul, Turkey. Ecology of Food and Nutrition, 49(6):452-466.
- Organization for Economic Co-operation and Development (OECD) 2010. Health at glance: Europe 2010. Available from URL: http://www.oecd.org/. [Accessed: 23 January 2016].
- Özdamar, K. 2013. Paket programlar ile istatistiksel veri analizi. Cilt:2, Nisan Kitap Evi, Eskişehir, Türkiye.
- Safefood. 2007. A review of the fruit and vegetable food chain: consumer focused review of the fruit and vegetable food chain. Safefood, February 2007.
- Sakar, E., Keskin, S., Unver, H. 2011. Using of Factor Analysis scores in Multiple Linear Regression model for prediction of Kernel Weight in Ankara Walnuts. The Journal of Animal and Plant Scince, 21(2):182-185.
- Sayın, C., Özkan, B., Ceylan, R. F. 2011. The role of wholesale markets in the supply chain for fresh fruits and vegetables in Turkey. Acta Hortic, 895: 263-268.
Tabachnick, B. G., Fidell, L. S. 2001. Using multivariate statistics. Boston, USA.
- Turkish Statistical Institute (TSI) 2015. Available from URL: http://www.tuik.gov.tr/Start.do;jsessionid=BJ8nWQGpLghd11f5z6g3dYs6ycQX6rnXCBhZz3Kgv4S1jTLRDH2Z!-1391686050. [Accessed: 23 July 2015].
- Tranmer, M., Elliot, M. 2005. Binary Logistic Regression. Cathie Marsh Center for Census and Survey Research, 1-43, Manchester, UK.
- Trienekens, J., Zuurbier, P. 2008. Quality and safety standarts in the food industry, develeopments and challanges. International Journal of Production Economics, 113:107-122.
- United Nations (UN). 2007. Safety and quality of fresh fruits and vegetables: a training manual for trainers. New York and Geneva.
- United State Depratment of Health and Human Services Food and Drug Administiration (USDHHSFDA). 1998. Guidence for industry: guide to minimize microbial food safety hazards for fresh fruits and vegetables., Center for Food Safety and Applied Nutrition. Washington DC, USA.
- United States of Agriculture Department (USDA). 2008. Price Tends Are Similar for Fruits, Vegetables and Snack Food.. Economic Research Report. Number:55, USA.
- University of Maryland (UM). 2010. Improving the safety and quality of fresh fruits and vegetables: a training manual for trainers. FDA Joint Intsitute for Food Safety and Applied Nutrion. Maryland, USA.
- Weisong, M., Chengcheng, L., Dong, T., Jianying, F. 2015. Chinese consumers’ behavior and preference to table grapes based on a comparative study of 2009 and 2014. British Food Journal, 118(1): 231-246.
- Wilcock, A., Pun, M., Khanona, J., Aung, M. 2004. Consumer attitudes, knowledge and behavior: a review of food safety issues. Trends in Food Sceince and Technology, 15(2): 56-66.
- World Health Organization (WHO). 2011. Five keys to growing safer fruits and vegetables: promoting health by decreasing microbial contamination. Trail Edition for Field Testing.
- World Health Organization (WHO). 2016. Available from URL: http://www.who.int/dietphysicalactivity/fruit/en/. [Accessed: 18 March 2016].
- Yahaya, I., Yamoah, F. A., Adams, F. 2015. Consumer motivation and willingness to pay for safer vegetable in Ghana. British Food Journal, 117(3):1043-1065.
- Yeung R. M. W., Morris, J. 2001. Food safety risk: consumer perception and purchase behavior. British Food Journal, 103(3):170-187.
- Yılmaz H., Demircan, V., Gül, M. 2010. Examing of chemical fertilizer use levels in terms of agricultural environment relations and economic losses in the agricultural farms: the case of Isparta, Turkey. Bulgarian Journal of Agricultural Science, 16(2):143-157.
- Yiridoe, E. K., Bonti-Ankomah, S., Martin, R. C. 2005. Comparison of consumers perceptions and preference toward organic versus conventionally produced foods: A review and update of the literature. Renewable Agriculture and Food Systems, 20(4):193-2005.
- Zhu, M. 2009. Understanding and using Factor scores: considerations for the applied researcher. Pratical Assesment. Research and Evaluation, 14(20):1-11.