Restriction/ Ban Year

After the
Restriction/Ban Year

 

Before/During the Restriction/Ban Year

 

Chi-square Test

No. of Houses

% Detects (No.)

 

No. of Houses

% Detects (No.)

 

Frequency of detection between Restriction/Ban Periods

Restricted

 

 

 

 

 

 

 

 

Alachlor

1988

43

2.33 (1)

 

147

0.68 (1)

 

-

Chlorpyrifos

2001

2

50.00 (1)

 

188

83.51 (157)

 

-

Diazinon

2002

1

0

 

189

33.86 (64)

 

-

Lindane

1977b

64

0

 

126

7.14 (9)

 

-

Banned

 

 

 

 

 

 

 

 

α-Chlordane

1988

43

16.28 (7)

 

147

78.23 (115)

 

P <0.001

γ-Chlordane

1988

43

30.23 (13)

 

147

85.03 (125)

 

P <0.001

4,4’-DDE

1972

70

8.57 (6)

 

120

40.83 (49)

 

P <0.001

4,4’-DDT

1972

70

15.71 (11)

 

120

54.17 (65)

 

P <0.001

Dieldrin

1987

45

2.22 (1)

 

145

22.07 (32)

 

P <0.01

Heptachlor

1988

42

2.34 (1)

 

146

46.26 (68)

 

P <0.001

Methoxychlor

2000

4

0

 

182

26.37 (48)

 

-

aNine homes had missing values for the year in which the house was constructed.
bThe noted year is when indoor fumigation was cancelled. Lindane is still in use for lice treatment.
Table 3: Percent detectable concentrations for restricted or banned pesticides by whether the sampled home was built before/during or after the restriction or ban year (N=190a).