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Question: How do you rate the usefulness of the following strategies for understanding and memorising the text? - I underline important parts of the text.
Choices: 1 "Not useful at all" - 6 "Very useful"
Data: Average score
Period:
Area:
10 countries/ areas
Highlight:
1 Republic of Korea4.56
2 Japan 4.46
3 Italy4.35
3 United Kingdom4.35
5 Germany4.23
6 France4.10
7 United States4.01
8 Australia3.95
9 Canada3.74
10 Sweden3.68

Note
The data of Azerbaijan are collected only in Baku. The data of China are collected only in Beijing, Shanghai, Jiangsu, and Zhejiang.

Source
OECD PISA 2018 Compendia

Correlations with major national performance indices
Life satisfaction (10 steps)
No. of data10
Regression equation
Y = -1.336140 X +12.301
Correlation coefficient (r)-0.832
Coefficient of determination (R2)0.692

GDP per capita (current US$)
No. of data10
Regression equation
Y = -29533.916202 X +172092.315
Correlation coefficient (r)-0.748
Coefficient of determination (R2)0.560

Life expectancy at birth - Both sexes (years)
No. of data10
Regression equation
Y = 1.831355 X +74.303
Correlation coefficient (r)0.277
Coefficient of determination (R2)0.077

Fertility rate, total (births per woman)
No. of data10
Regression equation
Y = -0.557607 X +3.772
Correlation coefficient (r)-0.601
Coefficient of determination (R2)0.361

Suicide - all ages (per 100,000 population)
No. of data10
Regression equation
Y = 5.192022 X -7.541
Correlation coefficient (r)0.260
Coefficient of determination (R2)0.068