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Table 1 The proportion of occurrence and average number of Anopheles arabiensis breeding sites in sentinel grid cells across different ecological zones in La Reunion Island from 1996 to 2009.

From: Spatial and temporal distribution patterns of Anopheles arabiensis breeding sites in La Reunion Island - multi-year trend analysis of historical records from 1996-2009

Studied zone Sampling period Numbers of grids sampled Number of positive grid cells (%) Total number
of breeding sites
Mean (M) number of breeding sites (SEM) Observed maximum number Variance (V) Dispersion (V/M)
NORTHEAST 1997 1972 136 (6.90) 99 1.37 (0.07) 6 0.60 0.44
  2003 2129 305 (14.33) 109 2.80 (0.30) 17 10.34 3.69
  2009 2317 558 (24.08) 176 3.17 (0.32) 27 18.32 5.78
SOUTH 1997 1470 34 (2.31) 26 1.31 (0.12) 3 0.38 0.29
  2003 1552 150 (9.66) 60 2.50 (0.22) 10 3.13 1.25
  2009 1616 256 (15.84) 102 2.51 (0.28) 16 8.11 3.23
WEST 1997 1164 285 (24.48) 100 2.85 (0.26) 16 7.01 2.46
  2003 1003 52 (5.18) 31 1.68 (0.17) 4 0.95 0.57
  2009 1185 246 (20.76) 40 6.15 (1.84) 67 136.02 22.11
  1. Prevalences (%) are given for the total numbers of grid cells within each zone that did have at least one larval habitat in the specified year. Total and mean numbers of breeding sites per individual grid cell are also displayed. Data is presented separately for each of the 3 study periods