Table 12 The correlation between BMI and a number of hours spent by a child on physical activity and the frequency (a week) of the use of sports facilities by a child depending on age and sex

10 years old (n = 94)

11 years old (n = 76)

12 years old (n = 69)

13 years old (n = 32)

Number of hours a week spent by a child on physical activity

Spearman’s rho

− 0.28

− 0.15

0.05

− 0.11

significance

0.006

0.193

0.691

0.548

The frequency (a week) of the use of sports facilities by a child

Spearman’s rho

0.19

0.09

− 0.03

0.11

significance

0.061

0.413

0.797

0.563

10 years old (n = 108)

11 years old (n = 54)

12 years old (n = 75)

13 years old (n = 34)

Number of hours a week spent by a child on physical activity

Spearman’s rho

− 0.11

− 0.40

− 0.26

− 0.05

significance

0.249

0.003

0.025

0.768

The frequency (a week) of the use of sports facilities by a child

Spearman’s rho

0.05

0.25

0.10

0.23

significance

0.624

0.071

0.392

0.188