| Round |
Years |
No. X-rayed |
Category 1 |
Category 2+ |
All Categories |
| |
|
|
No. |
Prevalence |
No. |
Prevalence |
No. |
Prevalence |
| 1 |
1959-63 |
462999 |
32608 |
7 |
23401 |
5 |
56009 |
12.1 |
| 3 |
1969-73 |
238759 |
16389 |
6.9 |
7888 |
3 |
24277 |
10.2 |
| 5 |
1978-81 |
198055 |
6256 |
3.2 |
1902 |
1 |
8158 |
4.1 |
| 7 |
1986-89 |
76802 |
453 |
0.6 |
65 |
0.1 |
518 |
0.7 |
| 8 |
1990-93 |
36970 |
138 |
0.4 |
10 |
0.01 |
148 |
0.4 |
| 9 |
1994-97 |
6378 |
13 |
0.2 |
0 |
0 |
13 |
0.2 |
| |
1998-2000 |
4647 |
26 |
0.6 |
9 |
0.2 |
35 |
0.8 |
|
