<qa>  Has experienced marked impairment as documented by a score consistent with severe impairment 7 or more on atx. Has experienced marked impairment as documented by a score consistent with severe impairment 7 or more on at least one of the three subscales of the Sheehan Disability Scale SDS, which includes an assessment of work-life, family-life, and social life nomild impairment 0-3, moderate impairment 4-6, severe impairment 7-10 