Appendix to 29 CFR Part 1630—Interpretive Guidance on Title I of the Americans With Disabilities Act

Section 1630.2(j)(1)(v)   Scientific, Medical, or Statistical Analysis Not Required, But Permissible When Appropriate

Section 1630.2(j)(1)(v) states: “The comparison of an individual's performance of a major life activity to the performance of the same major life activity by most people in the general population usually will not require scientific, medical, or statistical analysis. Nothing in this paragraph is intended, however, to prohibit the presentation of scientific, medical, or statistical evidence to make such a comparison where appropriate.”

The term “average person in the general population,” as the basis of comparison for determining whether an individual's impairment substantially limits a major life activity, has been changed to “most people in the general population.” This revision is not a substantive change in the concept, but rather is intended to conform the language to the simpler and more straightforward terminology used in the legislative history to the Amendments Act. The comparison between the individual and “most people” need not be exacting, and usually will not require scientific, medical, or statistical analysis. Nothing in this subparagraph is intended, however, to prohibit the presentation of scientific, medical, or statistical evidence to make such a comparison where appropriate.

The comparison to most people in the general population continues to mean a comparison to other people in the general population, not a comparison to those similarly situated. For example, the ability of an individual with an amputated limb to perform a major life activity is compared to other people in the general population, not to other amputees. This does not mean that disability cannot be shown where an impairment, such as a learning disability, is clinically diagnosed based in part on a disparity between an individual's aptitude and that individual's actual versus expected achievement, taking into account the person's chronological age, measured intelligence, and age-appropriate education. Individuals diagnosed with dyslexia or other learning disabilities will typically be substantially limited in performing activities such as learning, reading, and thinking when compared to most people in the general population, particularly when the ameliorative effects of mitigating measures, including therapies, learned behavioral or adaptive neurological modifications, assistive devices (e.g., audio recordings, screen reading devices, voice activated software), studying longer, or receiving more time to take a test, are disregarded as required under the ADA Amendments Act.