CREATE TABLE table_47070 ("Region" CLOB, "Physician  ( GP & specialist ) " FLOAT, "Physician : Population Ratio" CLOB, "Health Officer" FLOAT, "HO : Population Ratio" CLOB, "All Nurses" FLOAT, "Nurse : Population Ratio" CLOB, "Mid-wives" CLOB, "Mid Wife: Population Ratio" CLOB, "HEW*" CLOB)

What is the number of nurses in the region with an HO : Population Ratio of 1:16,791?
SELECT AVG("All Nurses") FROM table_47070 WHERE "HO : Population Ratio" = '1:16,791'
SELECT AVG("All Nurses") FROM "table_47070" WHERE "HO : Population Ratio" = '1:16,791'