Table 4 Correlates of measures of cardiorespiratory and neuromuscular fitness in JIA patients in multiple regression analyses

Wmax/kg (R²  = 0.431)

 Age

0.017

(-0.029, 0.066)

0.085

0.459

 Female sex

-0.423

(-0.693, -0.153)

-0.341

0.003

 Physical activity

0.003

(0.00, 0.008)

0.214

0.070

 ISO-BMI

-0.121

(-0.162, -0.079)

-0.619

 < 0.001

VO₂ peak/kg (R ²  = 0.374)

 Age

0.209

(-0.413, 0.830)

0.084

0.503

 Female sex

-6.565

(-10.051, -3.079)

-0.439

 < 0.001

 Physical activity

0.045

(0.005, 0.085)

0.285

0.028

 ISO-BMI

-1.138

(-1.721, -0.555)

-0.447

 < 0.001

50-m shuttle run (R ²  = 0.200)

 Age

-0.383

(-0.645, -0.122)

-0.395

0.005

 Female sex

1.431

(-0.80, 2.942)

0.244

0.063

 Physical activity

-0.004

(-0.021, 0.014)

-0.057

0.680

 ISO-BMI

0.212

(-0.022,0.446)

0.230

0.075

Long jump (R ²  = 0.473)

 Age

5.09

(3.186,6,997)

0.586

 < 0.001

 Female sex

-19.5

(-30.527, -8.463)

-0.372

0.001

 Physical activity

0.023

(-0.105, 0.150)

0.040

0.722

Sit-up (R ²  = 0.311)

 Age

1.043

(0.585,1.501)

0.569

 < 0.001

 Female sex

-0.697

(-3.345, 1.951)

-0.063

0.600

 Physical activity

0.021

(-0.010, 0.051)

0.175

0.176

 ISO-BMI

-0.413

(-0.823, -0.003)

-0.237

0.049