Testing for toxic residues
in vegetables results in a sensitivity value of 92.3%, specificity
of 85.1%, accuracy of 87.1%, positive predictive value or the value
that shows the chances of the vegetable samples to test positive
of 70.6% and finally the negative predictive value or the chances
of the vegetable samples to test negative of 96.6%.
The dried salted fish shows a
Sensitivity value of 92.7%, specificity of 77.5%, accuracy of 82.3%, positive
predictive value and negative predictive value of 65.5 and 95.8 respectively.
Results from the survey of toxic residue level in vegetables by government-related-organizations
are then sent for further testing to ensure the safety of the consumers.
The two comparison methods are:
Using GT test kit in the lab from November 2539 to February 2543 gives the following
results:
|
|
|
|
|
|
GT-test kit testing |
528 |
178(33.7%) |
134(25.4%) |
44(8.3%) |
350(66.3%) |
Standard testing |
145(27.5%) |
130(24.6%) |
16(3.0%) |
383(72.5%) |
Considering the number of unsafe samples, the GT test kit turns
out be far more accurate; giving 44 unsafe samples as opposed to
16 unsafe samples as determined by the lab. Further study indicates
that the 44 unsafe samples can be categorized into 3 groups:
- 16 samples that both testing methods tested positive (standard methods
found a high level of toxic residue)
- GT
test kit found them to be unsafe, but the standard method found it
to be safe (most of the
samples contain a variety of different toxins in them)/no specified
value for the 16 samples
-
GT test kit found them to be unsafe, but the standard methods did
not found anything in the 12 samples.
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