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Table 1 Epidemic start years in Sri Lanka in relation to prevailing ENSO phases between: (a) 1870 and 1927. (b) 1928 and 2000. (c) 1928 and 1980 and (d) 1981 and 2000.

From: Epochal changes in the association between malaria epidemics and El Niño in Sri Lanka

(a) 1870–1927
  Epidemics Non-epidemic Total
El Niño 7 9 16
Non-Niño 2 40 42
Total 9 49 58
(b) 1928–2000
  Epidemics Non-epidemic Total
El Niño 4 14 18
Non-Niño 7 58 65
Total 11 72 83
(c) 1928–1980
  Epidemics Non-epidemic Total
El Niño 1 11 12
Non-Niño 6 35 41
Total 7 46 53
(d) 1981–2000
  Epidemics Non-epidemic Total
El Niño 3 3 6
Non-Niño 1 23 24
Total 4 26 30