text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_1555308_1 (prothrombin_time VARCHAR, platelet_count VARCHAR)
  ### Question:
  How many entries for prothrombin time are there where platelet count is "decreased or unaffected"?
  ### Answer:
  SELECT COUNT(prothrombin_time) FROM table_1555308_1 WHERE platelet_count = "Decreased or unaffected"