Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Demographic characteristics of the study samples.
| Country | Questionnaire method | Sample size | Males/females | Age |
|---|---|---|---|---|
| United States | Online | 300 | 90/210 | M = 21.56 (SD = 2.82) |
| Basque Country | Paper-pencil | 398 | 140/256 | M = 20.13 (SD = 1.72) |
| Total | 698 | 230/466 | M = 20.69 (SD = 2.33) |
