What is the male incarceration rate of maule?
CREATE TABLE "by_prison_inmates_and_incarceration_rate" (
  "region" text,
  "prison_inmates_men" real,
  "prison_inmates_women" real,
  "prison_inmates_total" real,
  "incarceration_rate_male" real,
  "incarceration_rate_female" real,
  "incarceration_rate_total" real,
  "country_comparison" text
);
SELECT MAX("incarceration_rate_male") FROM "by_prison_inmates_and_incarceration_rate" WHERE "region"='Maule';