Table 3.

Hierarchical multilevel models assessing predictors of functional limitations^*

Level, predictor	B	t
Step 2
Age	−0.16	−0.89
Disease activity	2.08	3.09†
Step 3
Pain intensity
Within-child	0.11	19.76‡
Between-child	0.12	6.94‡
Step 4
No. of painful body areas
Within-child	0.99	8.44‡
Between-child	0.004	0.01
Step 5
Stiffness intensity
Within-child	0.019	2.60†
Between-child	0.10	3.36†
Step 6
Fatigue intensity
Within-child	−0.01	−1.71
Between-child	0.008	0.16

^*The initial step of each model contained no predictors, in accordance with the procedures detailed by Raudenbush and Bryk (34).

^†P< 0.05.

^‡P< 0.0001.