Table 1.

Covariate Balance Between Case and Control Participants, Before and After Stratification, GAIN Study of Schizophrenia in African Americans, 2006–2008

	Mean of Z1		P Value	Mean of Z2		P Value	Mean of Z3		P Value
	D = 0	D = 1		D = 0	D = 1		D = 0	D = 1
Unadjusted	−0.043	0.045	0.056	0.091	−0.094	5.582e-05	−0.009	0.010	0.684
Stratum 1	−1.096	−1.023	0.644	1.647	1.590	0.470	−0.075	−0.173	0.502
Stratum 2	0.527	0.489	0.233	0.333	0.328	0.851	−0.104	−0.145	0.758
Stratum 3	0.622	0.616	0.861	−0.262	−0.265	0.845	−0.145	−0.043	0.339
Stratum 4	0.383	0.352	0.356	−0.643	−0.647	0.710	0.102	0.131	0.626
Stratum 5	−0.487	−0.377	0.065	−1.053	−1.028	0.133	0.222	0.206	0.713
Stratified			0.547			0.613			0.932

Abbreviation: GAIN, Genetic Association Information Network.