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Table 4 Correlations between physical fitness and the difference in the value of posture features in the frontal plane between the 1st and 2nd measurement with the back loading among boys n = 30

From: The impact of a school backpack's weight, which is carried on the back of a 7-year-old students of both sexes, on the features of body posture in the frontal plane

Variables

The difference between 1st and 2nd measurement

WY

SZ

SI

MO

ZW

OG

KNT−

0.25

0.27

0.18

0.30

0.13

0.24

KNT+

− 1.00**

1.00**

− 1.00**

− 1.00**

− 1.00**

− 1.00**

KLB−

− 1.00**

1.00**

− 1.00**

− 1.00**

− 1.00**

− 1.00**

UL−

0.23

0.14

0.51

0.22

− 0.14

0.13

OL−

0.71**

0.58*

− 0.05

− 0.24

− 0.07

0.09

OL+

0.24

0.17

0.10

− 0.50

0.18

0.11

TT−

1.00**

− 1.00**

1.00**

1.00**

1.00**

1.00**

TT+

0.43

0.47

0.13

− 0.46

0.17

0.22

TS−

− 1.00**

1.00**

− 1.00**

− 1.00**

− 1.00**

− 1.00**

TS+

− 0.26

− 0.01

0.44

0.50

− 0.02

0.31

KNM−

− 0.04

− 0.15

− 0.04

0.36

− 0.15

− 0.04

UK−

0.10

− 0.18

0.21

0.22

0.17

− 0.20

  1. Source: Own research
  2. **p < 0.01