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Table 2 Univariate correlation coefficients for the 6MWD and subject variables

From: Six-minute walking distance in healthy Chinese people older than 60 years

Variable

Male (n = 128)

Female (n = 138)

 

r-value

p-value

r-value

p-value

Age, years

−0.45

< 0.001

−0.47

< 0.001

Height, cm

0.36

< 0.001

0.36

< 0.001

Weight, kg

−0.004

NS

−0.03

NS

BMI, kg/m2

−0.25

< 0.05

− 0.29

< 0.001

HRi, bpm

−0.08

NS

−0.05

NS

HRf, bpm

0.26

< 0.05

0.27

< 0.05

HR change, bpm

0.31

< 0.001

0.34

< 0.001

SBPi, mmHg

−0.04

NS

−0.04

NS

DBPi, mmHg

0.05

NS

0.03

NS

SBPf, mmHg

0.18

< 0.05

0.20

< 0.05

DBPf, mmHg

0.16

< 0.05

0.19

< 0.05

SpO2i, %

0.02

NS

0.05

NS

SpO2f, %

0.01

NS

−0.02

NS

  1. 6MWD Six-minute walking distance; r-value: Pearson’s correlation coefficient; BMI Body mass index;
  2. i Initial, f Final, change Change with exercise, SBP Systolic blood pressure, DBP Diastolic blood pressure, HR Heart rate, SpO2 Oxygen saturation, SpO2i Resting SpO2, SpO2f End-test SpO2;