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Table 7 Raven’s tests: standardised detectable differences and equivalent levels for different designs

From: Evaluation of alternative school feeding models on nutrition, education, agriculture and other social outcomes in Ghana: rationale, randomised design and baseline data

 

Children aged 6 to 14 (in SDs)

Equivalent level

30 clusters

0.43

2.5

60 clusters

0.30

1.8

120 clusters

0.21

1.2

  1. SD standard deviation
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Trials

ISSN: 1745-6215