Question: What is the number of nurses in the region with an HO : Population Ratio of 1:16,791?
SQL: SELECT AVG("All Nurses") FROM "2-16539836-2" WHERE "HO : Population Ratio" = '1:16,791';

Question: What is the number of physicians in the region with an all nurses number of 91?
SQL: SELECT MIN("Physician (GP & specialist)") FROM "2-16539836-2" WHERE "All Nurses" = 91.0;