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. 2018 Apr 7;38(Suppl 1):35–42. doi: 10.1007/s00296-018-3984-6

Table 2.

Main psychometric characteristics between the parent and child version of the JAMAR

Parent N = 277/369 Child N = 233/240
Missing values (1st–3rd quartiles) 0.0 (0.0–0.4) 0.0 (0.0–0.4)
Response pattern PF and HRQoL positively skewed PF and HRQoL positively skewed
Floor effect, median
 PF 85.9% 88.0%
 HRQoL PhH 68.8% 71.2%
 HRQoL PsH 67.1% 69.5%
 Pain VAS 33.9% 33.1%
 Disease activity VAS 35.7% 40.3%
 Well-being VAS 41.9% 48.9%
Ceiling effect, median
 PF 0.4% 0.0%
 HRQoL PhH 2.2% 3.0%
 HRQoL PsH 1.1% 0.4%
 Pain VAS 0.0% 0.0%
 Disease activity VAS 4.0% 0.0%
 Well-being VAS 0.7% 0.4%
Items with equivalent item-scale correlation 87% for PF, 80% for HRQoL 80% for PF, 87% for HRQoL
Items with items-scale correlation ≥ 0.4 87% for PF, 100% for HRQoL 80% for PF, 90% for HRQoL
Cronbach’s alpha
 PF-LL 0.88 0.81
 PF-HW 0.87 0.81
 PF-US 0.72 0.71
 HRQoL-PhH 0.86 0.87
 HRQoL-PsH 0.77 0.73
Items with item-scale correlation lower than the Cronbach alpha 100% for PF, 100% for HRQoL 100% for PF, 100% for HRQoL
Test–retest intraclass correlation
 PF total score 0.92 0.47
 HRQoL-PhH 0.92 0.71
 HRQoL-PsH 0.83 0.11
Spearman’s correlation with JIA core-set variables, median
 PF 0.4 0.3
 HRQoL PhH 0.3 0.3
 HRQoL PsH 0.2 0.1
 Pain VAS 0.2 0.3
 Disease activity VAS 0.2 0.2
 Well-being VAS 0.3 0.3

JAMAR Juvenile Arthritis Multidimensional Assessment Report, JIA juvenile idiopathic arthritis, VAS visual analogue scale, PF physical function, HRQoL health-related quality of life, PhH physical health, PsH psychosocial health, PF-LL PF-lower limbs, PF-HW PF-hand and wrist, PF-US PF-upper segment