Table 6.

Gilbert score: physical examination joint score for the mean of index joints.^*

Age at prophylaxis start, years	Current age, years
	12−16	17−21	22−26	27−35
<2 (primary), n	4	8	9	4
Median (range)	0.5 (0.0−6.0)	0.0 (0.0−0.0)	0.0 (0.0−4.0)	0.0 (0.0−0.0)
2 to <6 (secondary), n	4	7	5	6
Median (range)	2.5 (0.0−5.0)	0.0 (0.0−5.0)	0.0 (0.0−7.0)	1.0 (0.0−12.0)
6 to <12 (secondary), n	−	12	12	3
Median (range)	−	2.0 (0.0−11.0)	3.5 (0.0−10.0)	7.0 (2.0−12.0)
12 to 18 (secondary), n	−	−	7	14
Median (range)	−	−	4.0 (0.0−11.0)	5.0 (0.0−17.0)
Never (on demand), n	−	1	10	12
Median (range)	−	0.0 (0.0−0.0)	7.0 (2.0−26.0)	6.5 (0.0−22.0)

^*Total score range, 0–12 points for ankles or knees.