Table 2.

Power analysis by hypothesized group.

Hypothesis	Groups	Full (N)	80% reduction of full N after SSEa due to response	Alpha valuesb	Power	Cohen effect size
1	All	1632	1306	.00207	0.999	0.52
2	Native American/Alaskan Native	200	160	.0083	0.830	0.52
3	Asian	200	160	.0083	0.830	0.52
4	Black	300	240	.00417	0.920	0.52
5	Latinx (English-speaking)	182	146	.00417	0.920	0.52
6	White	300	240	.00417	0.920	0.52
7	Native Hawaiian/Other Pacific Islanders	200	160	.0083	0.830	0.52
8	Latinx (Spanish-speaking)	250	200	.00102	0.939	0.52
9	Urban (nonrural)	1224	979	.00207	0.999	0.52
10	Rural	408	326	.00207	0.960	0.52
11	Low SESc	408	326	.00207	0.960	0.52
12	Mid/high SES	1224	979	.00207	0.999	0.52
13	Age	1632	1306	.00207	0.999	0.52

^aSSE: SMART Sex Ed.

^bThe total alpha after Bonferroni adjustment was .05. The full sample size will be increased by 15% to account for projected attrition to a final total of 1878. The 15% increase will be equally distributed across all subgroups (ie, Native American/Alaskan Native, Asian, Black, Latinx-English, White, Native Hawaiian/Other Pacific Islander, and Latinx-Spanish).

^cSES: socioeconomic status