. 2014 Nov 12;9(11):e112393. doi: 10.1371/journal.pone.0112393

Table 1. Unadjusted descriptive statistics and sample size for measures of self-regulation and speed of processing in fall and spring of kindergarten.

	Tools of the Mind				Control
	Fall		Spring		Fall		Spring
	N	Mean [SD]	N	Mean [SD]	N	Mean [SD]	N	Mean [SD]
Dimensional Change Accuracy	351	.65 [.13]	327	.73 [.12]	240	.66 [.13]	235	.73 [.14]
Hearts & Flowers Accuracy	390	.70 [.17]	403	.76 [.17]	273	.69 [.19]	284	.75 [.18]
Flanker Accuracy^a	346	.74 [.20]	––	––	227	.75 [.21]	––	––
Reverse Flanker Accuracy^b	––	––	342	.56 [.17]	––	––	234	.55 [.17]
EFs Accuracy z-score Composite	383	−.014 [77]	399	−.003 [.76]	263	−.004 [.82]	281	−.03 [.82]
Dimensional Change RT msec	339	1083.2 [154]	322	1067.4 [143]	234	1089.6 [145]	233	1077.6 [139]
Hearts & Flowers RT Mixed msec	361	1185.1 [222]	389	1084.3 [209]	247	1181.6 [218]	267	1111.1[207]
Flanker RT msec^a	324	1208.9 [209]	––	––	213	1202.8 [202]	––	––
Reverse Flanker RT msec^b	––	––	329	1420.7 [247]	––	––	224	1438.8 [231]
EFs RT z-score Composite	407	.03 [.85]	413	−.03 [.86	281	−.02 [.82]	288	.05 [.83]
Backward Span Percent Correct^b	––	––	416	.25 [.13]	––	––	282	.23 [.14]
Raven Matrices Sum Score	418	8.14 [1.9]	413	8.78 [1.5]	289	7.93 [1.9]	293	8.67 [1.7]
Dot-Probe Negative Bias	305	−14.14 [140]	313	−4.70 [124]	206	−18.47 [159]	229	8.25 [124]
Simple Speed RT msec	417	639.1 [212]	420	529.7 [116]	289	638.4 [199]	295	536.4 [124]
Rapid Color Naming Total Time	348	49.83 [17.7]	373	46.35 [14.4]	241	51.50 [16.4]	258	48.39 [17.2]
Sample 1 log Cortisol ug/dl	348	−2.13 [.69]	364	−2.03 [.60]	254	−2.07 [.65]	279	−2.05 [.60]
Sample 2 log Cortisol ug/dl	349	−2.23 [.68]	366	−2.10 [.57]	249	−2.13 [.67]	279	−2.12 [.61]
Sample 3 log Cortisol ug/dl	335	−2.33 [.67]	353	−2.19 [.55]	235	−2.25 [.67]	272	−2.22 [.62]
Sample 1 sq Alpha Amylase	357	8.02 [3.2]	362	7.99 [3.2]	253	7.80 [3.1]	278	8.25 [3.2]
Sample 2 sq Alpha Amylase	352	8.49 [3.2]	365	8.47 [3.3]	251	8.35 [3.2]	278	8.91 [3.4]
Sample 3 sq Alpha Amylase	342	8.43 [3.1]	355	8.44 [3.3]	233	8.26 [3.1]	268	8.83 [3.2]

fall [pretest] only,

spring [posttest] only.