Reduced physical activity in children and adolescents with Juvenile Idiopathic Arthritis despite satisfactory control of inflammation

Table 5 Disease characteristics in relation to level and pattern of physical activity

	Mean cpm	Minutes per day spent at >1500 cpm	Minutes per day spent at >3000 cpm (HPA)
Subgroup of JIA	F = 0.794	F = 0.927	F = 1.349
Analysis of variance	p = 0.531	p = 0.450	p = 0.255
Remission vs non-remission	F = 0.057	F = 0.369	F = 0.148
Analysis of variance	p = 0.811	p = 0.544	p = 0.701
Treatment^a	F = 0.502	F = 1.127	F = 0.199
Analysis of variance	p = 0.607	p = 0.328	p = 0.820
Disease duration	β = 0.27	β = 0.005	β = 0.077
Linear regression	p = 0.758	p = 0.957	p = 0.376
Number of active joints	β = − 0.104	β = − 0.119	β = − 0.153
Linear regression	p = 0.235	p = 0.171	p = 0.078
Physician global VAS	rho = − 0.60	rho = − 0.062	rho = − 0.105
Spearman correlation	p = 0.489	p = 0.476	p = 0.228
Patient/parent global VAS	rho = − 0.072	rho = − 0.062	rho = − 0.018
Spearman correlation	p = 0.416	p = 0.487	p = 0.841
CRP	β = − 0.050	β = − 0.079	β = − 0.149
Linear regression	p = 0.591	p = 0.393	p = 0.107
JADAS 27	β = − 0.085	β = − 0.093	β = − 0.134
Linear regression	p = 0.340	p = 0.294	p = 0.144
Number of active weight-bearing joints	β = − 0.074	β = − 0.069	β = − 0.213
Linear regression	p = 0.400	p = 0.432	p = 0.014^b
Number of joints with limited motion only	β = 0.054	β = 0.073	β = 0.105
Linear regression	p = 0.535	p = 0.405	p = 0.229
Tendinitis and/or enthesitis	473 vs. 455	68 vs. 63	27 vs. 26
T-test	p = 0.600	p = 0.402	p = 0.330
Pain VAS	rho = − 0.018	rho = − 0.002	rho = − 0.026
Spearman correlation	p = 0.841	p = 0.985	p = 0.775
CHAQ	rho = − 0.066	rho = − 0.065	rho = − 0.086
Spearman correlation	p = 0.457	p = 0.465	p = 0.334

^aTreatment: either only intra-articular steroid injection or only methotrexate or biologicals with or without methotrexate
^bSignificance (p) is given as two-tailed and α selected as 0.05

ISSN: 1546-0096