Table 3

Attack percentage by BTS treatment step and age group (in brackets when subgroup size less than 100)

BTS treatment stepAge group (years)
<55–1516–4445–7475+Overall
0(9)4410(14)6
13013912(16)13
2342218181820
3482128222525
4(55)354241(41)40
5(50)(60)(68)50(63)56
Overall372119232722