Table 3.

Analyses of Covariance for Mean Differences in PLE for Ethnic Density Categories Before and After Age 12.

	Mean # PLE	SE	Unstandardized Beta (SE)	Df	Statistical Comparison F/t	p-value
Ethnic density before 12				(10,1295)	7.70	<.0001
Concordant-own ethnic group	12.68	0.42	2.77 (.94)		2.93	0.003
Discordant-other REM group	15.90	0.82	5.99 (1.16)		5.18	<.0001
Mixed	11.95	0.51	2.04 (.96)		2.13	0.033
Predominantly White	9.91	0.90	-- (ref group)		--	--
Ethnic density after 12,				(10,1295)	6.31	<.0001
Concordant-own ethnic group	12.61	0.49	1.90 (.86)		2.21	0.027
Discordant-other REM group	14.82	0.76	4.11 (1.03)		3.99	<.0001
Mixed	12.33	0.45	1.62 (.83)		1.95	0.052
Predominantly White	10.71	0.78	-- (ref group)

Covariates include % below poverty, immigrant status, racial and ethnic group, lifetime cannabis use, and age. Missing data on covariates were deleted from analyses using listwise deletion. REM = racial and ethnic minority