CREATE TABLE table_16262 ("Religious group" TEXT, "Population %" TEXT, "Growth  ( 1991\\u20132001 ) " TEXT, "Sex ratio  ( total ) " FLOAT, "Literacy  ( % ) " TEXT, "Work participation  ( % ) " TEXT, "Sex ratio  ( rural ) " FLOAT, "Sex ratio  ( urban ) " FLOAT, "Sex ratio  ( child ) " FLOAT)

What is the lowest child sex ratio in groups where employment is 31.3%?
SELECT MIN("Sex ratio (child)") FROM table_16262 WHERE "Work participation (%)" = '31.3%'
SELECT MIN("Sex ratio (child)") FROM "table_16262" WHERE "Work participation (%)" = '31.3%'