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Table 3 Multiple mixed linear regression analyses, explaining Flanker task results in boys (n = 664)

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 boys (n = 664) After exclusion of boys who did not perform higher than chance (n = 612)
Explanatory variables Estimate S.E. p-value Estimate S.E. p-value
Age 0.28 0.04 0.000 0.28 0.05 0.000
BMI −0.08 0.04 0.054 −0.06 0.05 0.267
Socioeconomic status 0.00 0.04 0.994 0.01 0.06 0.808
Stunting (0 = not stunted, 1 = stunted)* −0.02 0.04 0.649 −0.05 0.04 0.304
Food insecurity −0.04 0.04 0.395 0.05 0.05 0.342
STH infection (0 = not infected, 1 = infected)* 0.01 0.02 0.497 0.02 0.03 0.643
Grip strength 0.12 0.04 0.005 0.08 0.04 0.033
Cardiorespiratory fitness 0.04 0.03 0.277 0.04 0.04 0.242
Flanker task: Accuracy (incongruent stimuli) Mixed multiple linear regression
  All boys (n = 664) After exclusion of boys who did not perform higher than chance (n = 612)
Age 0.20 0.06 0.001 0.29 0.05 0.000
BMI −0.08 0.04 0.048 −0.04 0.05 0.338
Socioeconomic status 0.07 0.05 0.105 0.06 0.06 0.315
Stunting (0 = not stunted, 1 = stunted)* 0.01 0.04 0.875 −0.03 0.04 0.496
Food insecurity −0.03 0.05 0.582 −0.02 0.06 0.705
STH infection (0 = not infected, 1 = infected)* 0.05 0.03 0.117 0.05 0.04 0.197
Grip strength 0.17 0.04 0.000 0.12 0.04 0.001
Cardiorespiratory fitness 0.05 0.05 0.302 0.04 0.05 0.350
Flanker task: Reaction time (congruent stimuli) Mixed multiple linear regression
  All boys (n = 664) After exclusion of boys who did not perform higher than chance (n = 612)
Accuracy (congruent stimuli) −0.06 0.03 0.101 −0.04 0.04 0.038
Age −0.47 0.04 0.000 −0.48 0.04 0.000
BMI 0.03 0.03 0.215 0.05 0.04 0.141
Socioeconomic status −0.08 0.05 0.130 −0.11 0.05 0.035
Stunting (0 = not stunted, 1 = stunted)* 0.03 0.03 0.288 0.06 0.03 0.063
Food insecurity 0.02 0.05 0.641 0.03 0.06 0.631
STH infection (0 = not infected, 1 = infected)* 0.00 0.03 0.934 −0.01 0.03 0.766
Grip strength −0.14 0.04 0.000 −0.14 0.03 0.000
Cardiorespiratory fitness −0.05 0.04 0.210 −0.04 0.04 0.243
Flanker task: Reaction time (incongruent stimuli) Mixed multiple linear regression
  All boys (n = 664) After exclusion of boys who did not perform higher than chance (n = 612)
Accuracy (congruent stimuli) 0.00 0.04 0.989 −0.06 0.04 0.210
Age −0.39 0.05 0.000 −0.42 0.04 0.000
BMI 0.04 0.04 0.277 0.03 0.04 0.447
Socioeconomic status −0.05 0.05 0.344 −0.06 0.05 0.212
Stunting (0 = not stunted, 1 = stunted)* 0.06 0.03 0.042 0.07 0.03 0.007
Food insecurity 0.00 0.06 0.954 0.02 0.07 0.810
STH infection (0 = not infected, 1 = infected)* 0.01 0.03 0.872 −0.01 0.04 0.871
Grip strength −0.14 0.04 0.001 −0.15 0.04 0.000
Cardiorespiratory fitness −0.07 0.04 0.088 −0.08 0.04 0.022
  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