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Table 2 Baseline characteristics and patient disposition, split according to study completion status

From: Neurodevelopmental status and adaptive behavior of pediatric patients with mucopolysaccharidosis II: a longitudinal observational study

Characteristic/disposition

Completed study

(n = 23)

Discontinued study

(n = 32)

Male, n (%)

23 (100)

32 (100)

Age, years

 Mean (SD)

7.30 (3.694)

4.39 (2.411)

 Median (min, max)

6.22 (3.4, 16.7)

3.49 (2.0, 12.4)

Age subgroups, n (%)

  

 < 7 years

15 (65.2)

27 (84.4)

 ≥ 7 years

8 (34.8)

5 (15.6)

Race, n (%)

  

 Asian

1 (4.3)

3 (9.4)

 Black or African American

0 (0)

1 (3.1)

 White

20 (87.0)

27 (84.4)

 Other

2 (8.7)

1 (3.1)

Height, cm

 Mean (SD)

117.6 (13.7)

107.2 (14.4)

 Median (min, max)

114.0 (101.0, 152.0)

104.1 (85.6, 143.4)

Weight, kg

 Mean (SD)

28.3 (14.0)

22.6 (6.3)

 Median (min, max)

25.2 (16.0, 83.3)

21.2 (14.6, 37.5)

Genotype category, n (%)

  

 Null variant (frameshift, nonsense,

 premature truncation, and large deletion)

2 (8.7)

10 (31.3)

 Missense/presumed missense

14 (60.9)

19 (59.4)

 Splice site variant/presumed splice site

 variant

7 (30.4)

3 (9.4)

Phenotype category, n (%)

  

 Mild

9 (39.1)

3 (9.4)

 Intermediate

4 (17.4)

2 (6.3)

 Severe

7 (30.4)

25 (78.1)

 Unclassifiable

3 (13.0)

2 (6.3)

Baseline DAS-II GCA score, n (%)

  

 ≤ 70

7 (30.4)

11 (34.4)

 > 70

14 (60.9)

12 (37.5)

 Missing

2 (8.7)

9 (28.1)

Receiving IV idursulfase, n (%)

  

 Yes

23 (100)

32 (100)

 No

0 (0)

0 (0)

  1. DAS-II, Differential Ability Scales, Second Edition; GCA, General Conceptual Ability; IV, intravenous; SD, standard deviation