Database: thrombosis_prediction
Question: For all patients with normal uric acid (UA), what is the average UA index based on their latest laboratory examination result?
SQL: SELECT AVG(T2.UA) FROM Patient AS T1 INNER JOIN Laboratory AS T2 ON T1.ID = T2.ID WHERE (T2.UA < 6.5 AND T1.SEX = 'F') OR (T2.UA < 8.0 AND T1.SEX = 'M') AND T2.Date = ( SELECT MAX(Date) FROM Laboratory )