Database: thrombosis_prediction
Question: What percentage of patients who were born in 1980 and were diagnosed with RA are women?
SQL: SELECT CAST(SUM(CASE WHEN SEX = 'F' THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(ID) FROM Patient WHERE Diagnosis = 'RA' AND STRFTIME('%Y', Birthday) = '1980'