CREATE TABLE table_10710364_2 (sex_ratio__child_ NUMBER, work_participation___percentage_ VARCHAR2)

What is the lowest child sex ratio in groups where employment is 31.3%?
SELECT MIN(sex_ratio__child_) FROM table_10710364_2 WHERE work_participation___percentage_ = "31.3%"
SELECT MIN("sex_ratio__child_") FROM "table_10710364_2" WHERE "31.3%" = "work_participation___percentage_"