What is the ratio between male and female cast members of the movie 'Iron Man?' Count how many have unspecified genders.
male refers to gender = 'Male'; female refers to gender = 'Female'; movie 'Iron Man' refers to title = 'Iron Man'; ratio = divide(sum(gender = 'Female'), sum(gender = 'Male'))
SELECT CAST(COUNT(CASE WHEN T3.gender = 'Male' THEN 1 ELSE NULL END) AS REAL) / COUNT(CASE WHEN T3.gender = 'Female' THEN 1 ELSE NULL END) AS RATIO , COUNT(CASE WHEN T3.gender = 'Unspecified' THEN 1 ELSE NULL END) AS UNGENDERS FROM movie AS T1 INNER JOIN movie_cast AS T2 ON T1.movie_id = T2.movie_id INNER JOIN gender AS T3 ON T2.gender_id = T3.gender_id WHERE T1.title = 'Iron Man'