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. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: Brain Cogn. 2016 May 17;106:33–41. doi: 10.1016/j.bandc.2016.02.002

Table 2.

Linear mixed model analysis of efficiency across PCNB tests.

Efficiency F df p1
Main effect Site 0.31 1, 202 0.58
Covariate Parental education 0.07 1, 195 0.79
Parental education × site 1.65 1, 188 0.20

The p-values were calculated in mixed model analysis with z-transformed efficiency (average of accuracy and speed) scores as an outcome variable with fixed effect for site with parental education and site × parental education interaction term as covariates. The random effect for subjects accounted for repeated measurements.