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. 2020 Oct 1;8(10):e21676. doi: 10.2196/21676

Table 1.

Sample characteristics at baseline and tests of risk (n=300) and nonrisk (n=55) group differences.

Characteristics			Risk participants		Nonrisk participants		Statistical comparison				P value
							t test (df)		Chi-square (df)
Age (years), mean (SD)			19.5 (0.71)		19.36 (0.68)		1.38 (353)		N/A^a		.17
Class standing (freshman), n %			169 (56.3)		35 (64)		N/A		1.0 (1)		.31
Sex (female), n %			207 (69)		30 (55)		N/A		4.4 (1)		.04
Race and ethnicity (non-Hispanic, White), n %^b			240 (80.3)		32 (58)		N/A		12.7 (1)		<.001
Fraternity/sorority member (affiliated), n %			107 (35.7)		6 (11)		N/A		13.1 (1)		<.001
Lifetime prescription history (endorsed any), n %			207 (69)		22 (40)		N/A		17.1 (1)		<.001
	Pain reliever (endorsed)	151 (50.3)		18 (33)		N/A		5.8 (1)		.02
	Tranquilizer (endorsed)	66 (22)		5 (9)		N/A		4.8 (1)		.03
	Stimulant (endorsed)	53 (17.7)		2 (4)		N/A		N/A		.007^c
	Sedative or barbiturate (endorsed)	23 (7.7)		1 (2)		N/A		N/A		.15^c

^aN/A: not applicable.

^bResponse missing for 1 risk participant.

^cFisher exact test.