Table 1:

Baseline demographics

Demographics
Total MR venograms Included	429
Total patients included	429
No. of MR venograms with IV contrast (%)	327 (76.2)
Age categories (No.) (%) (yr)
0	25 (5.8)
1–5	24 (5.6)
6–10	21 (4.9)
11–15	70 (16.3)
16–20	289 (67.4)
Mean age (SD) (yr)	15.1 (5.9)
Male (No.) (%)	129 (30.0)