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Table 1 Country-specific information for TIMSS 2015 participants

From: The sensitivity of TIMSS country rankings in science achievement to differences in opportunity to learn at classroom level

Country (grade) ISO N school N class N teacher N student M age ICGR
United Arab Emirates ARE 477 763 580 18,012 13.9 6–9
Australia AUS 285 645 998 10338 14.0 7–10
Bahrain BHR 105 197 166 4918 13.9 7–9
Botswana (9) BWA 159 169 165 5964 15.6 8–10
Canada CAN 276 409 395 8757 14.0 Varies
Chile CHL 171 173 171 4849 14.3 7–8
Egypt EGY 211 215 213 7822 14.1  
England ENG 143 213 606 4814 14.1 6–8
Hong Kong SAR HKG 133 145 144 4155 14.3 7–9
Ireland IRL 149 204 418 4704 14.4 7–9
Iran, Islamic Rep. of IRN 250 251 250 6130 14.1 7–9
Israel ISR 198 198 282 5463 14.0 7–9
Italy ITA 161 230 228 4481 13.8 6–8
Jordan JOR 252 260 254 7865 13.8 1–10
Japan JPN 147 147 147 4745 14.5 7, 8
Korea, Rep. of KOR 150 170 167 5309 14.4 7–9
Kuwait KWT 168 191 191 4503 13.8 6–9
Lebanon LBN 138 185 182 3873 14.2 7–9
Malta MLT 48 223 226 3817 13.8 7–11
Malaysia MYS 207 326 294 9726 14.3 7–9
Norway (8) NO8 142 216 207 4795 13.7 5–7, 8–10
Norway (9) NOR 143 215 205 4675 14.7 5–7, 8–10
New Zealand NZL 145 377 333 8142 14.1 7–9
Oman OMN 301 356 347 8883 13.9 5–10
Qatar QAT 131 238 222 5403 14.0 7–9
Saudi Arabia SAU 143 149 149 3759 14.1 7–9
Singapore SGP 167 334 320 6116 14.4 7, 8
Sweden SWE 150 206 221 4090 14.8 7–9
Thailand THA 204 213 205 6482 14.4 7–9
Turkey TUR 218 220 218 6079 13.9 6–8
Chinese Taipei TWN 190 191 201 5711 14.3 7–9
United States USA 246 534 396 10,221 14.2 Varies
South Africa (9) ZAF 292 328 319 12,514 15.7 7–9
Excluded countries
 Georgia GEO 153 187 171 4035 13.8 7–9
 Hungary HUN 144 241 171 4893 14.7 7–8
 Kazakhstan KAZ 172 239 206 4887 14.3 5–9
 Lithuania LTU 208 252 221 4347 14.6 7–8
 Morocco MAR 345 375 365 13,035 14.5 7, 8, 9
 Russian Federation RUS 204 221 209 4780 14.8 5–9
 Slovenia SVN 148 217 162 4257 13.9 6–7, 8–9
  1. Sample sizes for schools, classes, teachers and students, average age (Mage), and the intended science curriculum grade range (ICGR). Countries below the line are excluded from further reporting because the amount of missing curriculum implementation data exceeds 50%. Intended curriculum grade range is retrieved from Mullis et al. (2016)