Table 1.
Demographic Characteristics of the Sample
| Study | Country | Main Researcher | n | Sampling/Procedure | Mean Age (SD) | Age Range | Males, n (%) |
|---|---|---|---|---|---|---|---|
| 1 | United States | Cicero | 3162 | College | 20 (3.7) | 16–55 | 997 (31.5) |
| 2 | United States | Kwapil | 1556 | College | 19.5 (2.9) | 16–54 | 363 (23.3) |
| 3 | Spain | Fonseca-Pedrero | 1123 | College | 20.2 (2) | 18–29 | 224 (19.9) |
| 4 | United States | Compton | 1190 | College | 20.9 (4) | 16–52 | 284 (23.9) |
| 5 | United States | Chmielewski | 556 | College | — | — | 102 (18.3) |
| 6 | Mauritius | Raine | 1201 | Birth cohort | 23.4 (1.2) | 21–27 | 688 (57.3) |
| 7 | Italian | Preti | 649 | College | 24.3 (3.5) | 19–38 | 305 (47) |
| 8 | Australia | Wuthrich | 445 | College | 22.6 (6.3) | 17–53 | 126 (28.3) |
| 9 | United States | Cohen | 1458 | College | 19.3 (2.2) | 16–53 | 531 (36.4) |
| 10 | Belgium | Larøi | 357 | General | 25 (10.3) | 17–55 | 110 (38.8) |
| 11 | Australia | Badcock | 342 | General | 36.1 (11.6) | 17–55 | 182 (53.2) |
| 12 | Belgium | Laloyaux | 536 | General | 24.9 (8.1) | 18–55 | 135 (25.2) |
| 13 | Tunisia | Mechri | 458 | College | 20.4 (1.4) | 18–29 | 137 (29.9) |
| 14 | New Zealand | Linscott | 1648 | College | 20.1 (3.1) | 17–51 | 515 (30.3) |
| 15 | United Kingdom | Barkus | 774 | General | 21.6 (4.4) | 17–49 | 291 (37.6) |
| 16 | Australia | Barkus | 1144 | College | — | — | 326 (28.5) |
| 17 | United States | Suhr | 1169 | College | — | 299 (27.3) | |
| 18 | China | Chan | 4907 | College | 19.7 (1.6) | 16–24 | 2973 (60.6) |
| 19 | Canada | Zhang | 1849 | College | 20.8 (2.9) | 18–53 | 562 (30.4) |
| 20 | United States | Zhang | 1386 | MTurk | 31.9 (9.5) | 18–55 | 586 (42.3) |
| 21 | Greek | Tsaousis | 1041 | General | 32.4 (9.9) | 18–55 | 390 (37.5) |