Table 2

Characteristics of concurrent use (n=96 581)

Characteristic%
Total days of cumulative concurrency
Mean (SD)* 98 (114)*
 1–7 21
 8–30 26
 31–90 17
 >90 36
Longest Duration of consecutive concurrency
Mean (SD)* 45 (60)*
 1–7 24
 8–30 40
 31–60 13
 61–90 8
 >90 14
  • *Days.