. Author manuscript; available in PMC: 2010 Aug 2.

Published in final edited form as: Gait Posture. 2007 Oct 22;27(4):683–688. doi: 10.1016/j.gaitpost.2007.09.001

Table 3.

Mean values (S.D.) for cognitive tasks under single and dual task conditions

Cognitive task variable

Single task

Dual task

η_{p}^{2}

1-Back

RT (ms)

1763.65 (249.37)

1675.52 (129.13)

n.s.

.203

Accuracy (%)

98.92 (2.06)

98.77 (1.30)

n.s.

.004

Clock task

RT (ms)

2829.75 (924.49)

2486.28 (713.85)

n.s.

.304

Accuracy (%)

87.38 (10.02)

88.38 (8.94)

n.s.

.137

Spontaneous speech

Sentence length (words/utterance)

10.00 (2.17)

11.16 (3.53)

n.s.

Utterances/narrative

30.85 (12.19)

21.00 (6.86)

<0.02

Words/narrative

312.31 (142.26)

227.15 (78.37)

<0.05

Fillers/utterance

.53 (.15)

.65 (.18)

n.s.

Pauses/utterance

.50 (.26)

.76 (.43)

<0.02

Sentence complexity (clauses/utterance)

1.25 (23)

1.35 (.40)

n.s.

Proportion of grammatical sentences

.82 (.09)

.86 (.11)

n.s.

Proportion of utterances with new information

0.37 (0.13)

0.54 (0.23)

<0.03

n.s. denotes not significant; $η_{p}^{2}$ denotes partial eta squared, a measure of effect size that ranges from 0 to 1.