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Appendix S1 Study Procedures (A) IQ Assessments Determining IQ scores- earlier assessments. (B) Adjusting for the Flynn effect. (C) Exploring clinically significant change. (D) Decisions reuse of non/parametric analyses

Table S1 Educational Background and Current Social Status (n = 60)

Table S2 Changes in IQ scores from childhood to adulthood

Table S3 Determining Clinically Significant Change in IQ Over Time

Table S4 Characteristics of Individuals who were unable to be tested at follow-up. (A) No definite evidence of early decline. (B) IQ results inconsistent in early years. (C) Strong evidence of earlier decline.

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