Table 1 Summary of descriptives.

From: National parochialism is ubiquitous across 42 nations around the world

Nation

N

Language of the survey

Mage (SD)

%Females

%Coop

Cohen’s d

Argentina

387

Spanish

35.02 (11.09)

51.42

43.82

0.20

Australia

383

English

45.41 (13.40)

57.96

42.37

0.34

Bolivia

391

Spanish

30.40 (9.16)

46.80

49.46

0.15

Brazil

832*

Portuguese

34.50 (10.83)

61.66

38.68

0.11

Canada

379

English

44.11 (13.32)

55.94

44.83

0.40

China

393

Chinese

30.61 (8.36)

53.18

35.83

0.38

Colombia

399

Spanish

34.45 (11.81)

53.88

43.71

0.17

Egypt

408

Arabic

29.44 (8.50)

45.59

41.28

0.24

Finland

388

Finnish

40.95 (13.27)

54.64

45.08

0.30

Germany

391

German

44.90 (12.73)

51.92

39.88

0.20

Greece

396

Greek

40.19 (11.66)

54.55

37.28

0.38

Hong Kong

390

Complex Chinese

35.67 (11.00)

51.79

38.32

0.06

Hungary

391

Hungarian

41.27 (12.95)

56.78

46.12

0.21

India

834*

Hindi, English

33.37 (11.09)

45.92

36.92

0.20

Indonesia

384

Indonesian

34.00 (10.12)

49.74

35.06

0.20

Italy

675

Italian

41.33 (12.65)

57.19

39.88

0.18

Japan

393

Japanese

48.06 (11.82)

52.42

33.76

0.16

Kenya

383

English

30.48 (9.05)

49.61

38.93

0.17

Malaysia

404

Malay, English, Chinese

33.85 (10.30)

50.74

38.64

0.26

Mexico

408

Spanish

33.90 (11.52)

56.37

40.65

0.19

Morocco

394

Arabic

31.85 (9.68)

49.49

40.25

0.25

Netherlands

653

Dutch

46.45 (13.36)

55.28

42.55

0.29

New Zealand

386

English

41.89 (13.04)

59.33

47.27

0.31

Nigeria

395

English

30.93 (9.58)

44.30

40.75

0.06

Pakistan

388

Urdu

28.86 (8.85)

24.48

41.43

0.11

Panama

397

Spanish

31.55 (10.17)

53.65

45.60

0.20

Peru’

393

Spanish

34.12 (10.56)

58.78

44.34

0.05

Philippines

384

Filipino

34.56 (11.04)

55.73

36.83

0.26

Poland

776*

Polish

39.37 (13.07)

53.22

42.21

0.11

Portugal

448

Portuguese

37.98 (11.64)

55.58

40.69

0.25

Russia

387

Russian

39.76 (11.09)

51.16

39.93

0.32

Serbia

390

Serbian

37.60 (11.88)

55.13

43.48

0.24

Singapore

384

English

39.58 (11.99)

51.82

36.79

0.26

South Africa

390

English

35.24 (11.48)

52.31

41.29

0.14

South Korea

379

Korean

40.90 (11.47)

57.78

41.49

0.28

Spain

389

Spanish

41.16 (11.52)

56.81

43.21

0.15

Sweden

392

Swedish

43.15 (12.59)

53.57

45.16

0.15

Taiwan

392

Complex Chinese

36.31 (10.62)

55.36

43.22

0.22

Turkey

414

Turkish

33.45 (9.97)

44.20

42.85

0.35

UK

433

English

42.54 (12.78)

56.12

42.91

0.17

United States

378

English

42.44 (13.30)

60.05

48.27

0.23

Venezuela

435

Spanish

35.36 (11.53)

47.59

47.47

0.44

Total

18,411

 

37.40 (12.52)

52.77

41.49

0.22

  1. Nations, sample sizes, %females, mean age, language of the survey, average cooperation, Cohen’s d = standardized mean difference in cooperation between ingroup vs. outgroup and strangers (positive = more cooperation with ingroup). Source data are provided as a Source Data file.
  2. *Nation with the incentive treatment.