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баллы (mean_score) со стандартной ошибкой (dimensions.se), доли учеников, достигших международных уровней 400/475/550/625 баллов (pct_reaching_*, se там, где IEA его публикует), и доля ниже 400 (pct_below_low = 100 − доля достигших 400). source_report — PIRLS 2021 (таблицы трендов и результатов) или PIRLS 2016 (страны и циклы, которых нет в отчёте 2021). diff_vs: разность «этот цикл минус указанный» и значимость по оценке IEA (higher/lower/none). trend_comparable: строка входит в сравнимый ряд страны. as_published: значение из более раннего отчёта, если оно отличается (например, Азербайджан 2016: 470 в отчёте 2016, 472 в таблице трендов 2021). timing_2021: когда писали тест в 2021 году — в конце 4 класса по плану, с задержкой в начале 5 класса (дети на 4+ месяца старше; IEA показывает эти страны в отдельной таблице трендов) или на год позже; mode: цифровой digitalPIRLS, бумага или бумажная мостовая выборка (США); data_collection и средний возраст — в sample_note. notes — сноски IEA: 1/2/3 — охват, †/‡/≡ — участие школ ниже норм, ψ — оговорки (15–25% учеников слишком слабы для оценки), Ж — больше 25%, + / ± — в 2016 году страна писала облегчённую версию PIRLS Literacy (± — обе версии). Участники-бенчмарки (Москва, провинции Канады, эмираты ОАЭ и др.), Англия, Северная Ирландия и бельгийские сообщества — entity_type subnational. Россия — все циклы 2001–2021. Использование — по условиям IEA (некоммерческое, с указанием источника), не открытая лицензия.","notes_en":"Average scores (mean_score) with standard errors (dimensions.se), percentages reaching the 400/475/550/625 international benchmarks (pct_reaching_*, with se where IEA publishes it) and below 400 (pct_below_low = 100 − percent reaching 400). source_report is PIRLS 2021 (trend and results exhibits) or PIRLS 2016 (participants and cycles absent from the 2021 report). diff_vs: this cycle minus the given cycle with IEA significance (higher/lower/none). trend_comparable: the row belongs to the country's comparable series. as_published: the value printed in an earlier report when it differs (e.g. Azerbaijan 2016: 470 in the 2016 report, 472 in the 2021 trend table). timing_2021: when the 2021 test was taken - end of grade 4 as planned, delayed to the beginning of grade 5 (students 4+ months older; IEA reports these in a separate trend table) or one year later; mode: digitalPIRLS, paper, or paper bridge sample (United States); data collection period and average age are in sample_note. notes are IEA footnotes: 1/2/3 coverage, †/‡/≡ school participation below guidelines, ψ reservations (15-25% too low to estimate), Ж more than 25%, + / ± took the easier PIRLS Literacy version in 2016 (± both versions). Benchmarking participants (Moscow City, Canadian provinces, UAE emirates, ...), England, Northern Ireland and the Belgian communities are entity_type subnational. Russia: every cycle 2001-2021. Use under IEA terms (non-commercial, with attribution), not an open licence."}