This table contains 4740 series, with data for years 1990 - 1998 (not all combinations necessarily have data for all years), and was last released on 2007-01-29. This table contains data described by the following dimensions (Not all combinations are available): Geography (30 items: Austria; Belgium (French speaking); Belgium; Belgium (Flemish speaking) ...), Sex (2 items: Males; Females ...), Age group (3 items: 11 years;15 years;13 years ...), Person (6 items: Father; Brother(s);Sister(s);Mother ...), Response (6 items: Very easy; Difficult; Very difficult; Easy ...).