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Table 4 Multiple mixed linear regression analyses, explaining Flanker task results in girls (n = 613)

From: How are academic achievement and inhibitory control associated with physical fitness, soil-transmitted helminth infections, food insecurity and stunting among South African primary schoolchildren?

Flanker task: Accuracy (congruent stimuli) Mixed multiple linear regression
All girls (n = 613) After exclusion of girls who did not perform higher than chance (n = 555)
Explanatory variables Estimate S.E. p-value Estimate S.E. p-value
Age 0.28 0.05 0.000 0.33 0.05 0.000
BMI 0.04 0.05 0.457 0.03 0.04 0.536
Socioeconomic status 0.08 0.06 0.186 0.06 0.05 0.181
Stunting (0 = not stunted, 1 = stunted)* 0.01 0.05 0.770 0.03 0.04 0.471
Food insecurity 0.02 0.06 0.716 0.09 0.06 0.164
STH infection (0 = not infected, 1 = infected)* −0.17 0.06 0.006 −0.17 0.09 0.047
Grip strength 0.02 0.07 0.781 −0.03 0.07 0.656
Cardiorespiratory fitness 0.14 0.04 0.000 0.12 0.05 0.013
Flanker task: Accuracy (incongruent stimuli) Mixed multiple linear regression
  All girls (n = 613) After exclusion of girls who did not perform higher than chance (n = 555)
Age 0.29 0.06 0.000 0.34 0.06 0.000
BMI −0.08 0.05 0.103 −0.09 0.06 0.119
Socioeconomic status 0.01 0.04 0.871 −0.01 0.05 0.848
Stunting (0 = not stunted, 1 = stunted)* −0.08 006 0.174 −0.02 0.05 0.636
Food insecurity −0.02 0.05 0.697 0.02 0.05 0.685
STH infection (0 = not infected, 1 = infected)* −0.11 0.06 0.064 −0.06 0.07 0.386
Grip strength 0.01 0.04 0.874 0.00 0.06 0.984
Cardiorespiratory fitness 0.17 0.04 0.000 0.13 0.05 0.007
Flanker task: Reaction time (congruent stimuli) Mixed multiple linear regression
  All girls (n = 613) After exclusion of girls who did not perform higher than chance (n = 555)
Accuracy (congruent stimuli) −0.09 0.03 0.009 −0.09 0.04 0.021
Age −0.42 0.05 0.000 −0.41 0.06 0.000
BMI −0.03 0.04 0.372 −0.03 0.04 0.426
Socioeconomic status 0.09 0.04 0.030 0.08 0.05 0.071
Stunting (0 = not stunted, 1 = stunted)* 0.03 0.04 0.378 0.07 0.04 0.078
Food insecurity −0.02 0.05 0.669 −0.03 0.05 0.605
STH infection (0 = not infected, 1 = infected)* 0.03 0.04 0.370 0.02 0.03 0.572
Grip strength −0.08 0.05 0.131 −0.09 0.056 0.104
Cardiorespiratory fitness −0.11 0.06 0.045 −0.12 0.06 0.040
Flanker task: Reaction time (incongruent stimuli) Mixed multiple linear regression
  All girls (n = 613) After exclusion of girls who did not perform higher than chance (n = 555)
Accuracy (congruent stimuli) −0.06 0.06 0.287 −0.10 0.04 0.025
Age −0.37 0.05 0.000 −0.37 0.05 0.000
BMI 0.00 0.04 0.914 0.00 0.04 0.987
Socioeconomic status 0.03 0.05 0.529 0.07 0.05 0.191
Stunting (0 = not stunted, 1 = stunted)* 0.03 0.04 0.396 0.08 0.04 0.052
Food insecurity −0.05 0.05 0.268 −0.06 0.05 0.219
STH infection (0 = not infected, 1 = infected)* 0.04 0.04 0.291 0.03 0.02 0.221
Grip strength −0.07 0.05 0.148 −0.10 0.05 0.032
Cardiorespiratory fitness −0.10 0.05 0.034 −0.13 0.05 0.021
  1. Notes. School class was used as a random intercept across all analyses. Being “not stunted” and being “not infected” are used as reference. STH Soil-transmitted helminths. Statistically significant associations are highlighted with bold font