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Table 1 Illustration of patient numbers by treatment with 3 levels and covariate with 2 levels

From: Randomization in substance abuse clinical trials

 

Factor 1

 

Treatment

1

2

 

1

X11

X12

 

2

X21

X22

 

3

X31

X32

 
   

N

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Substance Abuse Treatment, Prevention, and Policy

ISSN: 1747-597X