Table 3.
ICC for each of the 30 OECD countries.
| Country | Between-school variance | Within-school variance | Total variance | ICC |
|---|---|---|---|---|
| Australia | 0.0066 | 0.6878 | 0.6944 | 0.0095 |
| Austria | 0.0434 | 0.9945 | 1.0379 | 0.0418 |
| Belgium | 0.0136 | 0.7881 | 0.8017 | 0.0169 |
| Chile | 0.0223 | 0.8035 | 0.8258 | 0.0270 |
| Czech Republic | 0.0223 | 0.8035 | 0.8258 | 0.0270 |
| Denmark | 0.0083 | 0.7739 | 0.7822 | 0.0107 |
| Estonia | 0.0021 | 0.8469 | 0.8490 | 0.0025 |
| Finland | 0.0064 | 0.7557 | 0.7620 | 0.0083 |
| France | 0.0013 | 0.9443 | 0.9456 | 0.0014 |
| Germany | 0.0029 | 0.8733 | 0.8762 | 0.0033 |
| Greece | 0.0050 | 0.8330 | 0.8380 | 0.0060 |
| Hungary | 0.0183 | 0.8790 | 0.8973 | 0.0204 |
| Iceland | 0.0067 | 0.7800 | 0.7866 | 0.0085 |
| Ireland | 0.0093 | 0.7760 | 0.7854 | 0.0119 |
| Israel | 0.0463 | 0.9173 | 0.9636 | 0.0481 |
| Italy | 0.0242 | 0.7533 | 0.7776 | 0.0312 |
| Japan | 0.0162 | 0.9991 | 1.0154 | 0.0160 |
| Korea | 0.0154 | 0.7720 | 0.7874 | 0.0196 |
| Latvia | 0.0044 | 0.7741 | 0.7785 | 0.0057 |
| Luxembourg | 0.0119 | 0.9723 | 0.9842 | 0.0121 |
| Mexico | 0.0915 | 0.9512 | 1.0427 | 0.0877 |
| Netherlands | 0.0037 | 0.6947 | 0.6983 | 0.0053 |
| New Zealand | 0.0037 | 0.6947 | 0.6983 | 0.0053 |
| Poland | 0.0101 | 0.8376 | 0.8477 | 0.0119 |
| Portugal | 0.0112 | 0.7900 | 0.8013 | 0.0140 |
| Slovak Republic | 0.0112 | 0.7900 | 0.8013 | 0.0140 |
| Slovenia | 0.0436 | 0.8823 | 0.9258 | 0.0470 |
| Sweden | 0.0081 | 0.8961 | 0.9042 | 0.0090 |
| Switzerland | 0.0243 | 0.9212 | 0.9454 | 0.0257 |
| UK | 0.0042 | 0.4032 | 0.4075 | 0.0103 |
Note. The intraclass correlation coefficient is calculated as the proportion of total variance that is accounted for by the clustering of students in schools.