Table 1.

Characteristics of Patients.

Variable	Mean	Median	10^th – 90^th Percentiles	N^a
Age (years)	8.0	7.4	3.2 – 13.5	181
Hct (%)	22.8	22.2	17.8 – 28.1	181
SpO₂ (%)	96.6	97.0	92 – 100	167
TCD Velocities (cm/s)
RMCA	143	141	104 – 183	178
LMCA	150	148	103 – 189	175
RACA	121	122	80 – 162	164
LACA	118	115	82 – 154	157
RdICA	122	122	79 – 126	82
LdICA	124	121	85 – 166	82
VB	108	106	79 – 135	168
Proxy for Stenosis
RMCA:VB	1.37	1.33	1.03 – 1.74	166
LMCA:VB	1.43	1.37	1.02 – 1.92	165

Number of subjects who had data for analysis of each variable