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Table 1 Percentage of Anopheles gambiae (s.s.) females from the Asembo study area of western Kenya with the 2La/a, 2La/+a or and 2L+a/+a karyotypes

From: Decline in frequency of the 2La chromosomal inversion in Anopheles gambiae (s.s.) in Western Kenya: correlation with increase in ownership of insecticide-treated bed nets

Year n 2La/a 2La/+a 2L+a/+a F
1994 45 100 (92.3–100) 0 (0.0–7.7) 0 (0.0–7.7) nd
1996 28 78.6 (63.3–93.8) 3.6 (0.0–10.5) 17.9 (3.6–32.1) 0.86***
2000 50 44.0 (30.2–57.9) 10.0 (1.7–18.3) 46.0 (32.1–59.9) 0.21 ns
2005 83 8.4 (2.4–14.4) 19.3 (10.8–17.8) 72.3 (62.6–82.0) 0.39*
2008 70 12.9 (5.0–20.7) 21.4 (11.8–31.1) 65.7 (54.6–76.9) 0.48*
2009 17 0.0 (0.0–19.5) 41.2 (17.7–64.7) 58.8 (35.3–82.3) 0.61**
2011 151 9.9 (5.1–14.7) 23.8 (17.0–30.7) 66.2 (58.7–73.8) 0.81***
  1. A test of Hardy-Weinberg equilibrium is indicated by the F-statistic
  2. n number of female mosquitoes analyzed, ns not significant, nd not done
  3. *P < 0.05, **P < 0.01, ***P < 0.001