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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