"We obtained complete data from 196 US-American individuals who participated in an online study via Amazon Mechanical Turk, a service where researchers can post

"We obtained complete data from 196 US-American individuals who participated in an online study via Amazon Mechanical Turk, a service where researchers can post jobs (such as responding to a questionnaire) which can be completed by users of Amazon Mechanical Turk Only demographic information about sex, age, and in what country participants live was collected" I imagine the type of people who seek income from Mechanical Turk can skew these results significantly.