Table 2.

Summary statistics by gambling group

Variable	Non-problem Gambler	Problem Gambler	Unskilled Gambler	Skilled Gambler
Age	Mean = 32.285 SD = 7.709	Mean = 32.022 SD = 7.929	Mean = 31.821 SD = 7.790	Mean = 32.925 SD = 7.639
Female = 1	Number (proportion) 195 (52%)	Number (proportion) 35 (39%)	Number (proportion) 154 (53%)	Number (proportion) 76 (44%)
U.K. = 1 (vs. USA)	Number (proportion) 265 (71%)	Number (proportion) 65 (72%)	Number (proportion) 221 (76%)	Number (proportion) 109 (63%)
Gambling Frequency*	Mean = 0.576 SD = 0.942	Mean = 1.800 SD = 1.104	Mean = 0.216 SD = 0.597	Mean = 1.810 SD = 0.988
CRT score	Mean = 3.325 SD = 2.121	Mean = 3.356 SD = 1.97	Mean = 3.289 SD = 2.180	Mean = 3.379 SD = 1.937
Total participants	375	90	291	174

Gambling Frequency was self-reported by participants, on a scale of 0-4: 0 (never gamble); 1 (less than once a month); 2 (once or twice a month); 3 (once or twice a week); 4 (daily). For example, a score of 1.800 would indicate that identified Problem gamblers, on average, report current gambling between less than once a month and once or twice a month