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Table 2: Prevalence of medical conditions in patients with Williams syndrome
Medical Condition Study
Wint et al^a (n = 14) AAP^b (n = 315) Cherniske et al^c (n = 20)
n % % %
Cardiovascular 12 86 80 70
    SVAS 9 64 75 65
    SVPS 3 21 25 15
    Peripheral pulmonary stenosis 1 7 50 –
    Mitral valve prolapse 3 21 − 15
    Other 1 7 − 35
    Hypertension 4 29 50 60
Gastrointestinal 11 79 − 75
    Inguinal hernia 5 36 40 −
    Constipation 7 50 40 25
    Diverticular disease 3 21 30 40
    Rectal prolapse 1 7 15 −
Neurologic 
    Hyperreflexia 7 50 75 65
    Gait disturbance 11 79 60 70
    Ataxia 10 71 − −
Skeletal 6 43 50 −
    Spinal 3 21 60 60
    Peripheral 5 36 50 55
Chronic otitis 4 29 50 −
Note:—This is a comparison of the prevalence of medical problems in this study's participants with those reported in 2 large studies of Williams syndrome. The number of participants with each condition is listed in the leftmost column.
↵a Present study.
↵b American Academy of Pediatrics, 2001.³²
↵c Cherniske et al, 2004.³³

Medical Condition	Study
	Wint et al^a (n = 14)		AAP^b (n = 315)	Cherniske et al^c (n = 20)
	n	%	%	%
Cardiovascular	12	86	80	70
SVAS	9	64	75	65
SVPS	3	21	25	15
Peripheral pulmonary stenosis	1	7	50	–
Mitral valve prolapse	3	21	−	15
Other	1	7	−	35
Hypertension	4	29	50	60
Gastrointestinal	11	79	−	75
Inguinal hernia	5	36	40	−
Constipation	7	50	40	25
Diverticular disease	3	21	30	40
Rectal prolapse	1	7	15	−
Neurologic
Hyperreflexia	7	50	75	65
Gait disturbance	11	79	60	70
Ataxia	10	71	−	−
Skeletal	6	43	50	−
Spinal	3	21	60	60
Peripheral	5	36	50	55
Chronic otitis	4	29	50	−