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Table 2 Classification of the MCM datasets for 8 West African countries

From: Relationships between climate and year-to-year variability in meningitis outbreaks: A case study in Burkina Faso and Niger

   Very low IR < 7.2 Low 7.2 < IR < 18.9 High 18.9 < IR < 41.3 Very high IR > 41.3
1 Benin 4 15 9 5
2 Burkina Faso 0 1 18 15
3 Chad 5 9 9 11
4 Mali 10 12 4 6
5 Niger 0 1 9 20
6 Nigeria 19 9 2 1
7 Sudan 18 2 6 4
8 Togo 8 14 7 2
  1. Classification of the meningitis dataset (34 annual values from 1966 to 1999 for 8 West African countries) into four categories according to log-Incidence Rate (log-IR) thresholds. Since the log-IR are normally distributed, the classification has been done according to quartile groups which divide the sorted data set into four equal parts, so that each part represents 1/4 of the sampled population. The IR range of the four resulting categories is shown in the first row.