TABLE 4.
Secondary analysis of the behavioral and EEG variables, examining the relation between change in the behavioral and EEG variables and change in blood iron markers1
| Change in blood marker | |||||
|---|---|---|---|---|---|
| Task | Change variable | Predictor | Intercept | β | R2 |
| Behavioral variables | |||||
| GNG | Median RT | log10(SF) | −16 | −60 | 0.18 |
| ANT | RT, spatial cues | SF | −166 | −4 | 0.11 |
| Conflict | |||||
| RT, consistent flankers | |||||
| RT, inconsistent flankers | log10(SF) | −96 | −141 | 0.18 | |
| SMS | RT intercept, new items | SF | −36 | −24 | 0.35 |
| RT intercept, old items | SF | 55 | −21 | 0.34 | |
| RT slope, new items | BdFe | 4 | −11 | 0.21 | |
| RT slope, old items | BdFe | −8 | −13 | 0.24 | |
| CRT | Sensitivity, 4-cue trials | SF | 0.32 | 0.03 | 0.11 |
| Criterion, 4-cue trials | Hb | −0.01 | −0.20 | 0.12 | |
| RT, 4-cue trials, new items | SF | −1 | −13 | 0.19 | |
| RT, 4-cue trials, old items | BdFe | 3 | −50 | 0.32 | |
| Percent change in capacity | Hb | 53.6 | 26.9 | 0.12 | |
| EEG variables | |||||
| SRT | α-power, central electrodes | Hb | −0.01 | 0.11 | 0.13 |
| GNG | N1 amplitude, central electrodes | Hb | −66 | −60 | 0.13 |
| α-power, central electrodes | SF | −0.12 | 0.03 | 0.20 | |
| ANT | N1 amplitude, occipital, 0 cues | Hb | −1.16 | −1.28 | 0.15 |
| N1 amplitude, occipital, 2 cues | Hb | −1.55 | −0.89 | 0.11 | |
| N1 amplitude, occipital, center cues | |||||
| N1 amplitude, occipital, spatial cues | BdFe | −0.92 | −0.34 | 0.10 | |
| N1 amplitude, occipital, consistent flankers | |||||
| N1 amplitude, occipital, inconsistent flankers | SF | −1.06 | −0.11 | 0.12 | |
| SMS | N1 amplitude, central, new items, set size 3 | log10(SF) | −0.28 | −6.31 | 0.17 |
| N1 amplitude, central, new items, set size 6 | log10(SF) | 0.14 | −6.43 | 0.24 | |
| N1 amplitude, central, old items, set size 1 | log10(SF) | 0.29 | −6.57 | 0.24 | |
| N1 amplitude, central, old items, set size 3 | log10(SF) | 0.03 | −5.39 | 0.19 | |
| N1 amplitude, central, old items, set size 6 | log10(SF) | −0.32 | −4.94 | 0.14 | |
| α-power, occipital, new items, set size 1 | log10(SF) | −0.03 | 0.14 | 0.17 | |
| α-power, frontal, new items, set size 3 | SF | −0.01 | 0.01 | 0.18 | |
| α-power, occipital, new items, set size 6 | SF | −0.01 | 0.01 | 0.19 | |
| α-power, occipital, old items, set size 1 | SF | −0.02 | 0.01 | 0.20 | |
| α-power, frontal, old items, set size 6 | SF | −0.01 | 0.01 | 0.18 | |
| CRT | N1 amplitude, central, new items, 4 cues | Hb | 1.08 | −1.13 | 0.11 |
| N1 amplitude, central, old items, 4 cues | Hb | −0.31 | −1.75 | 0.17 | |
| α-power, central, new items, 4 cues | Hb | 0.01 | 0.02 | 0.10 | |
| α-power, central, old items, 4 cues | Hb | 0.01 | 0.03 | 0.12 | |
1Blank entries, or absence of a variable, indicate that no acceptable model was identified for that variable/analysis. All reported β-values were significantly different from 0. ANT, attentional network task; BdFe, body iron; BL, baseline; CRT, cued recognition task; EL, endline; GNG, go/no-go task; Hb, hemoglobin; SF, serum ferritin; SMS, Sternberg memory search task; SRT, simple reaction time task.