| NOTE: Instructional days per years is the number of school days per year that school is open for instruction as reported by principals. Population coverage, participation rates, or sampling procedures deviated from international standards for 4th graders in the following jurisdictions (years in parentheses): Alberta-CAN (11, 07), Australia (03, 95), Austria (95), Azerbaijan (11), British Columbia-CAN (07), Croatia (11), Denmark (11, 07), Dubai-UAE (07), England (03, 95), Florida-US (11), Georgia (11, 07), Hong Kong (11, 03), Hungary (95), Israel (95), Kazakhstan (11, 07), Kuwait (11, 95), Latvia (07, 95), Lithuania (11, 07, 03), Massachusetts-US (07), Minnesota-US (07), Mongolia (07), the Netherlands (11, 07, 03, 95), North Carolina-US (11), Northern Ireland (11), Norway (11), Ontario-CAN (07), Qatar (11), Quebec-CAN (07), Scotland (07, 03, 95), Serbia (11), Singapore (11), Slovenia (95), Thailand (95), and United States (11, 07, 03); and for 8th graders in: Alabama-US (11), Alberta-CAN (11), Australia (95), Austria (95), Belgium (Flemish) (99, 95), Belgium (French) (95), British Columbia-CAN (07), California-US (11), Colombia (95), Colorado-US (11), Connecticut-US (11), Denmark (95), Dubai-UAE (07), England (11, 07, 03, 99, 95), Florida-US (11), Greece (95), Georgia (11, 07), Germany (95), Honduras-Grade 9 (11), Hong Kong (07, 03, 99), Indiana-US (11), Indonesia (03), Israel (11, 07, 03, 99, 95), Kuwait (95), Latvia (99, 95), Lithuania (11, 07, 03, 99, 95), Macedonia (03), Massachusetts-US (11, 07), Minnesota-US (11, 07), Mongolia (07), Morocco (03, 07), Netherlands (03, 99, 95), North Carolina-US (11) Ontario-CAN (11, 07), Quebec-CAN (07), Romania (95), Russian Federation (11), Scotland (07, 03, 95), Serbia (07, 03), Singapore (11), Slovenia (95), Switzerland (95), Thailand (95), and United States (11, 07, 03, 95). Data from these jurisdictions have issues that interfere with proper trend analysis: Armenia, Australia, Indonesia, Israel, Italy, Kazakhstan, Kuwait, Latvia, Morocco, New Zealand, Qatar, Saudi Arabia, Slovenia, South Africa, Syrian Arab Republic, Thailand, and Turkey, Yemen. Details are available in the Help Guide. The gen\instructional days per year ranges from 150 to 280. Some apparent differences between estimates may not be statistically significant. Standard error is noted by s.e. |