TABLE 3

Parental Knowledge of Exposure to Ionizing Radiation From Diagnostic Tests Relative to Daily Background Radiation

Relative to Background RadiationSkull Radiographs (n = 742)Head CT (n = 742)
Less than a day124 (16.7)104 (14.0)
A few days157 (21.2)a133 (17.9)
A couple of weeks75 (10.1)79 (10.6)
1 month83 (11.2)64 (8.6)
6 to 8 months60 (8.1)78 (10.5)a
3 to 4 years25 (3.4)49 (6.6)
I do not know218 (29.4)235 (31.7)
  • Data are presented as n (%).

  • a Most correct estimate.