Chapter Assessment of the quality of marine bathing waters using different methods of percentile calculation
Escherichia coli (E. coli) and intestinal enterococci (ENT) are the indicator bacteria used to test the microbiological quality of bathing water. In Croatia, the quality of bathing water is assessed by parametric method i.e. on the basis of the 90th and 95th percentile values which are calculated us...
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Firenze University Press
2025
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| Online Erişim: | ONIX_20250801T173835_9791221505566_236 |
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| _version_ | 1869527705346637824 |
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| author | Vrcek, Zrinka Mance, Diana Cenov, Arijana Glad, Marin Mance, Davor Vukić Lušić, Darija |
| author_browse | Cenov, Arijana Glad, Marin Mance, Davor Mance, Diana Vrcek, Zrinka Vukić Lušić, Darija |
| author_facet | Vrcek, Zrinka Mance, Diana Cenov, Arijana Glad, Marin Mance, Davor Vukić Lušić, Darija |
| author_sort | Vrcek, Zrinka |
| collection | Directory of Open Access Books |
| description | Escherichia coli (E. coli) and intestinal enterococci (ENT) are the indicator bacteria used to test the microbiological quality of bathing water. In Croatia, the quality of bathing water is assessed by parametric method i.e. on the basis of the 90th and 95th percentile values which are calculated using the corresponding arithmetic mean and standard deviation of the logarithmic bacterial concentrations. There are also non-parametric methods for determining the value of a particular percentile, and one of them is the so-called Hazen method. In this work, we study how the different methods of percentile calculation affect the assessment of coastal bathing water quality. We have chosen a "problematic" location with frequently elevated bacterial concentrations as a test site.The results show that in the case of E. coli, the 95th percentile values calculated using the Hazen method are significantly lower than those calculated using the parametric method (Wilcoxon rank test, p < 0.05), while for ENT there was no statistically significant difference. For case of annual assessment, the difference in coastal bathing water quality was statistically significant for both ENT and E. coli (McNemar test, p=0.004 and p=0.02 respectively). In the final classification, the difference in coastal bathing waters quality was statistically significant only in the case of E. coli (McNemar test, p=0.025). |
| format | Online |
| id | doab-20.500.12854ir-163460 |
| institution | Directory of Open Access Books |
| language | eng |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | Firenze University Press |
| publisherStr | Firenze University Press |
| record_format | ojs |
| spelling | doab-20.500.12854ir-1634602025-08-02T05:09:54Z Chapter Assessment of the quality of marine bathing waters using different methods of percentile calculation Vrcek, Zrinka Mance, Diana Cenov, Arijana Glad, Marin Mance, Davor Vukić Lušić, Darija microbiology bathing water quality statistical methods Hazen percentile method Escherichia coli (E. coli) and intestinal enterococci (ENT) are the indicator bacteria used to test the microbiological quality of bathing water. In Croatia, the quality of bathing water is assessed by parametric method i.e. on the basis of the 90th and 95th percentile values which are calculated using the corresponding arithmetic mean and standard deviation of the logarithmic bacterial concentrations. There are also non-parametric methods for determining the value of a particular percentile, and one of them is the so-called Hazen method. In this work, we study how the different methods of percentile calculation affect the assessment of coastal bathing water quality. We have chosen a "problematic" location with frequently elevated bacterial concentrations as a test site.The results show that in the case of E. coli, the 95th percentile values calculated using the Hazen method are significantly lower than those calculated using the parametric method (Wilcoxon rank test, p < 0.05), while for ENT there was no statistically significant difference. For case of annual assessment, the difference in coastal bathing water quality was statistically significant for both ENT and E. coli (McNemar test, p=0.004 and p=0.02 respectively). In the final classification, the difference in coastal bathing waters quality was statistically significant only in the case of E. coli (McNemar test, p=0.025). 2025-08-02T05:09:53Z 2025-08-02T05:09:53Z 2025-08-01T15:54:52Z 2024 chapter ONIX_20250801T173835_9791221505566_236 2975-0288 https://library.oapen.org/handle/20.500.12657/104786 9791221505566 https://directory.doabooks.org/handle/20.500.12854/163460 eng Monitoring of Mediterranean Coastal Areas: Problems and Measurement Techniques open access image/jpeg Attribution-NonCommercial-ShareAlike 4.0 International https://library.oapen.org/bitstream/20.500.12657/104786/1/43727.pdf Firenze University Press 10.36253/979-12-215-0556-6.82 10.36253/979-12-215-0556-6.82 2ec4474d-93b1-4cfa-b313-9c6019b51b1a 9791221505566 10 Florence open access |
| spellingShingle | microbiology bathing water quality statistical methods Hazen percentile method Vrcek, Zrinka Mance, Diana Cenov, Arijana Glad, Marin Mance, Davor Vukić Lušić, Darija Chapter Assessment of the quality of marine bathing waters using different methods of percentile calculation |
| title | Chapter Assessment of the quality of marine bathing waters using different methods of percentile calculation |
| title_full | Chapter Assessment of the quality of marine bathing waters using different methods of percentile calculation |
| title_fullStr | Chapter Assessment of the quality of marine bathing waters using different methods of percentile calculation |
| title_full_unstemmed | Chapter Assessment of the quality of marine bathing waters using different methods of percentile calculation |
| title_short | Chapter Assessment of the quality of marine bathing waters using different methods of percentile calculation |
| title_sort | chapter assessment of the quality of marine bathing waters using different methods of percentile calculation |
| topic | microbiology bathing water quality statistical methods Hazen percentile method |
| topic_facet | microbiology bathing water quality statistical methods Hazen percentile method |
| url | ONIX_20250801T173835_9791221505566_236 |
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