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Table 5 Statistical analysis of the top 20 n-gram features from the PrADG and HEG based on Student’s t-test

From: Predicting probable Alzheimer’s disease using linguistic deficits and biomarkers

n-gram

PrADG MEAN(SD)

HEG MEAN(SD)

t

df

p

95% CI(Difference)

the window

0.12(0.38)

0.62(0.82)

-5.45

196

<0.000*

-0.67 to -0.32

mother is

0.15(0.44)

0.60(0.70)

-5.37

196

<0.000*

-0.61 to -0.28

be quiet

0.01(0.10)

0.22(0.44)

-4.66

196

<0.000*

-0.30 to -0.12

is open

0.04 (0.24)

0.31(0.58)

-4.29

196

<0.000*

-0.40 to -0.15

the mother

0.22(0.46)

0.61(0.74)

-4.37

196

<0.000*

-0.56 to -0.21

tipping over

0.00(0.00)

0.17(0.43)

-3.98

196

<0.000*

-0.26 to -0.09

window is

0.01(0.10)

0.19(0.40)

-4.43

196

<0.000*

-0.26 to -0.10

girl is

0.14(0.40)

0.44(0.57)

-4.29

196

<0.000*

-0.44 to -0.16

is tipping

0.00(0.00)

0.14(0.35)

-4.02

196

<0.000*

-0.21 to -0.07

the window is

0.01(0.10)

0.18(0.39)

-4.27

196

<0.000*

-0.25 to -0.09

the mother is

0.11(0.35)

0.42(0.61)

-4.45

196

<0.000*

-0.45 to -0.17

of the cookie

0.08(0.31)

0.32(0.49)

-4.16

196

<0.000*

-0.36 to -0.13

the stool

0.33(0.74)

0.58(0.67)

-2.41

196

0.017*

-0.44 to -0.04

is overflowing

0.05(0.33)

0.22(0.42)

-3.20

196

0.002*

-0.28 to -0.07

the sink

0.68(0.91)

1.17(1.01)

-3.62

196

<0.000*

-0.76 to -0.22

this is

0.25(0.61)

0.02(0.14)

3.68

196

<0.000*

0.11 to 0.36

cookie out

0.00(0.00)

0.11(0.32)

-3.50

196

0.001*

-0.17 to -0.05

cookie out of

0.00(0.00)

0.11(0.32)

-3.50

196

0.001*

-0.17 to -0.05

a cookie out

0.00(0.00)

0.10(0.30)

-3.32

196

0.001*

-0.16 to -0.04

off the cookie

0.01(0.10)

0.14(0.35)

-3.59

196

<0.000*

-0.20 to -0.06

  1. *PrADG Probable Alzheimer’s Disease Group (N=99), HEG Healthy Elderly Group (N=99), SD Standard Deviation, df degree of freedom, CI Confidence Interval