How many entries for prothrombin time are there where platelet count is "decreased or unaffected"?
CREATE TABLE "laboratory_findings_in_various_platelet_" (
  "condition" text,
  "prothrombin_time" text,
  "partial_thromboplastin_time" text,
  "bleeding_time" text,
  "platelet_count" text
);
SELECT COUNT("prothrombin_time") FROM "laboratory_findings_in_various_platelet_" WHERE "platelet_count"='Decreased or unaffected';