Table 9 Unweighted effect sizes and descriptive statistics for “Valuing Mathematics” for eighth graders

Thailand

0.3

10.57

1.86

Botswana

0.22

11.45

2

Malaysia

0.22

10.04

1.79

Oman

0.18

10.86

2.09

Turkey

0.07

10.13

2.21

Morocco

0.05

11.17

2.07

South Africa

0.04

11.19

1.88

Israel

0.03

10.55

2.21

Saudi Arabia

0.02

9.87

2.54

Egypt

0

10.81

2.24

Jordan

− 0.02

11

2.37

Kazakhstan

− 0.04

9.98

2.07

Bahrain

− 0.05

9.71

2.44

Lithuania

− 0.06

9.67

1.94

United States

− 0.07

9.91

2.1

Chinese Taipei

− 0.07

8.08

1.95

Lebanon

− 0.09

10.6

2.29

Argentina

− 0.09

9.75

2.09

Norway

− 0.1

10.09

1.93

Canada

− 0.11

10.2

1.95

Hungary

− 0.11

9.16

1.91

Singapore

− 0.12

9.56

1.83

Korea Republic

− 0.12

8.5

1.8

Chile

− 0.12

9.89

2.15

Iran

− 0.13

10.23

2.21

Slovenia

− 0.13

8.86

1.76

Malta

− 0.14

9.82

2.1

Georgia

− 0.14

9.94

2.16

United Arab Emirates

− 0.18

9.85

2.23

Qatar

− 0.18

9.78

2.46

Hong Kong

− 0.18

8.51

2.15

Ireland

− 0.19

9.64

1.85

Sweden

− 0.19

9.19

1.92

New Zealand

− 0.21

9.71

1.95

Kuwait

− 0.22

9.83

2.12

Russian Federation

− 0.22

9.2

1.93

Italy

− 0.23

8.68

1.75

Australia

− 0.27

9.62

1.99

Japan

− 0.27

8.27

1.63

England

− 0.3

9.81

1.86