A rural version of the test was used for this study because it was the standard test for children between 4 and 15 years of age who lived in rural settings in China.
The last group was tested on their English skills, but not with the standard test.
Finally, the validity of these findings is uncertain because the reference standard test for illness severity was the unverified final diagnoses made by the treating physicians and not standard, microbiologically based definitions.
If so, that difference would be interesting because the non-standard tests include genotype sets in which the maximal fitness is usually below the high-fitness wild-type strain.
No statistical test is carried out in the mean comparison analysis because standard tests are not valid due to the correlations among the observations from sibling clustering and repeated measures of the same individuals at Add Health Waves.
This sequential testing is used mainly to increase feasibility because applying the gold standard test to the negatives is often costly, unacceptable, and unethical.
Test guidelines also contributes to promote the reliability of the data by making it easier to repeat the experiment if needed because of the detailed standard test procedures and extensive reporting of data that is required.
Similarly, the accuracy of the SIT may be overestimated because it is also part of the reference standard test.
10 However, the location of pain may be variable 9 and diagnosis may present a challenge, particularly for the non-specialist and particularly in the early stages, when the signs are not pronounced: not least because false-positive responses to standard tests for shoulder impingement (Neer's sign, Hawkins' test) are to be expected.
Moreover, these non-standard tests may have greater power because their "reach" extends over mutational distances of four, rather than the two allowed by standard tests.
