Table 2:

Demographics for all participants included in and excluded from analyses.

Measure	EN-back (N=6,009) Sample included in paper	EN-back (N= 4,353) Sample not included in paper	Statistics Age = t-test between participants in paper vs. excluded from paper All other variables = Pearson chi-square	SST (N=5,547) Sample included in paper	SST (N=4,815) Sample not included in paper	Statistics Age = t-test between participants in paper vs. excluded from paper All other variables = Pearson chi-square	MID (N=6,657) Sample included in paper	MID (N=3,705) Sample not included in paper	Statistics Age = t-test between participants in paper vs. excluded from paper All other variables = Pearson chi-square
Sex Male Female No answer	3,051 2,958	2,378 1,974 1	X2 (1, N=10,361) = 15.14 p<.001 Cramer’s V = -.04	2,767 2,780	2,666 2,149	X2 (1, N=10,362) = 30.63, p<.001 Cramer’s V = -.05	3,357 3,300	2,073 1,632	X2 (1, N=10,362) = 28.98, p<.001 Cramer’s V = -.05
Age (M±SD) Nine Ten	9.96 ± 0.63 2,929 3,080	9.84 ± 0.61 2,529 1,824	t(9,520.93)= 10.31, p<.001	9.96 ± 0.63 2,731 2,816	9.86 ± 0.62 2,713 2,102	t(10,361) = 298.92, p<.001	9.95 ± 0.63 3,335 3,322	9.85 ± 0.61 2,123 1,582	t(7,814.1) = 8.14, p<.001
Race/Ethnicity White Black Hispanic/Latino Asian Other No answer	3,428 685 1,170 121 605	1,884 926  920 93 513 17	X2 (4, N=10,345) = 262.28, p<.001 Cramer’s V = .16	3,172 657 1,069 114 535	2,148 957 1,023 100 585 2	X2 (4, N=10,360) = 206.05, p<.001 Cramer’s V = .14	3,680 826 1,347 129 675	1,632 785  743 85 443 17	X2 (4, N=10,345) = 185.56, p<.001 Cramer’s V = .13
Highest Household Ed. < Highschool Diploma Highschool Diploma/GED Some College Bachelors Post-Graduate Degree No answer	192 445 1,493 1,650 2,221 8	288 545 1,293 1,003 1,215 9	X2 (4, N=10,345) = 236.65, p<.001 Cramer’s V = .15	182 437 1,359 1,517 2,044 8	298 553 1,429 1,136 1,393 6	X2 (4, N=10,348) = 170.76, p<.001 Cramer’s V = .13	244 553 1,671 1,795 2,386 8	236 437  1,115 858 1,050 9	X2 (4, N=10,345) = 143.87, p<.001 Cramer’s V = .12
Household Income / Year <50K 50K-100K >100K No answer Participant did not know	1,395 1620 2,584 229 181	1,475 1,084 1,344 205 245	X2 (2, N=9,502) = 203.70, p<.001 Cramer’s V = .15	1,285 1,485 2,382 224 171	1,585 1,220 1,546 209 255	X2 (2, N=9,503) = 168.93, p<.001 Cramer’s V = .13	1,613 1,774 2,780 250 240	1,257 930 1,148 189 181	X2 (2, N=9,502) = 155.41, p<.001 Cramer’s V = .13
Handedness Right Left Ambidextrous	4,849 418 742	3,401 325 627	X2 (2, N=10,362) = 11.08, p=.004 Cramer’s V = .03	4,497 377 673	3,753 366 696	X2 (2, N=10,362) = 16.01, p<.001 Cramer’s V = .04	5,379 470 808	2,871 273 561	X2 (2, N=10,362) = 19.85, p<.001 Cramer’s V = .04