Table 1 Participant characteristics

General

 Age (years), mean (SD)^a

10.6 (3.9)

5 to 18

 Sex, n (%) male

28 (56)

N/A

 Type of DS, n (%)

N/A

 Trisomy 21/Translocation/Mosaic

44 (88)/5 (10)/1 (2)

 Any type of medication, n (%)

23 (46)

N/A

 Height (cm), mean (SD)

131.9 (18.6)

96.0 to 164.5

 Weight (kg), mean (SD)

39.6 (18.4)

16.3 to 85.1

 Body mass index (kg/m²), mean (SD)

 Overall

21.5 (5.3)

13.8 to 34.9

 Males

21.1 (4.9)

14.7 to 33.8

 Females

22.1 (5.8)

13.8 to 34.9

Foot structure

 Arch Index, mean (SD)

0.29 (0.08)

0.01 to 0.39

 Foot posture, n (%)^b

 Flat/typical/high arch

38 (76)/6 (12)/6 (12)

 Hallux valgus, n (%)

5 (10)

N/A

 Lesser toe deformity, n (%)

6 (12)

N/A

Footwear fit^c

 Length (%)

9.0 (7.5)

−14.3 to 23.3

 Width (%)

−4.5 (10.0)

−26.5 to 13.6

OxAFQ-C domain scores, mean (SD)

 Physical^d (%)

72.8 (21.4)

33.3 to 100.0

 School and play^d (%)

84.9 (18.1)

31.3 to 100.0

 Emotional^d (%)

92.9 (13.8)

43.8 to 100.0

 Footwear (%)

67.5 (3.9)

0.0 to 100.0