Table 2.

Summary statistics of the difference and the absolute value of the difference between the estimated age and the chronological age in JRA-affected subjects

Panel A: age estimation error,  E
Variable		n (%)	Demirjian mean (s.d.)	Willems mean (s.d.)	p Value
Sex	Female	79 (77)	0.54 (0.94)	− 0.32 (1.03)	< 0.01
	Male	24 (23)	0.27 (0.74)	− 0.17 (0.97)	0.03
		p Value	0.14	0.51
Under treatment	Yes	40 (39)	0.59 (0.93)	− 0.35 (1.01)	< 0.01
	No	63 (61)	0.41 (0.88)	− 0.25 (1.02)	< 0.01
		p Value	0.35	0.77
Panel B: absolute age estimation error, |E|
Variable			Demirjian median (1st–3rd quartile)	Willems median (1st–3rd quartile)	p Value
Sex	Female		0.81 (0.27–1.00)	0.84 (0.36–1.14)	0.72
	Male		0.54 (0.14–0.71)	0.69 (0.28–0.70)	0.31
		p Value	0.03	0.17
Under treatment	Yes		0.86 (0.27–1.13)	0.86 (0.55–1.10)	0.72
	No		0.67 (0.19–0.81)	0.76 (0.24–1.05)	0.30
		p Value	0.06	0.16

The p value refers to the significance of a t statistics in panel A and to the significance of Wilcoxon statistics in Panel B