Table 5 Day-to-day differences in centre of pressure displacement measures.

From: Day-to-day variations in sleep quality affect standing balance in healthy adults

Measure

Control group (N = 6)

Case group (N = 14)

MD

IQR

p

MD

IQR

p

Trend

Area, left foot (cm2)

0.014

0.248

0.688

0.048

0.281

0.049

↑↑

Area, right foot (cm2)

−0.049

0.207

0.313

0.031

0.176

0.011

↑↑

Area, average (cm2)

0.003

0.55

0.844

0.042

0.239

0.035

↑↑

Amplitude, AP, left foot (cm)

0.248

0.437

0.563

0.319

1.693

0.025

↑↑

Amplitude, AP, right foot (cm)

−0.066

0.969

0.844

0.228

0.609

0.013

↑↑

Amplitude, AP, average (cm)

0.091

0.343

0.688

0.252

1.121

0.020

↑↑

Standard deviation, AP, left foot (cm)

0.006

0.099

0.844

0.056

0.364

0.058

↑

Standard deviation, AP, right foot (cm)

−0.032

0.089

0.438

0.046

0.217

0.035

↑↑

Standard deviation, AP, average (cm)

0.005

0.12

1

0.048

0.283

0.042

↑↑

  1. Median difference and its interquartile range for subjects without day-to-day variation in sleep quality (Control group) and subjects with variation in day-to-day sleep quality (Case group).
  2. AP = Anterior-posterior.
  3. MD = Median difference; IQR = Interquartile range.
  4. p = P-values from two-tailed paired Wilcoxon tests. Bold values indicate significant differences (p < 0.05).
  5. ↓↓ (↑↑) = Significantly lower (higher) after poorer sleep quality night.
  6. ↓ (↑) = Lower (higher) after poorer sleep quality night.
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