What is the scale of sv_health with a word number smaller than 4?
CREATE TABLE "message_format" (
  "subframe_num" real,
  "page_num" text,
  "name" text,
  "word_num" real,
  "bits" text,
  "scale" text,
  "signed" text
);
SELECT "scale" FROM "message_format" WHERE "word_num"<4 AND "name"='sv_health';