Cases with days of restricted work activity only have risen from 0.7 per 100 workers in 1990 to 1.2 cases per 100 workers in 1997.  Cases resulting in days away from work, on the other hand, have declined for seven years in a row; at 2.1 cases per 100 workers, the 1997 rate was the lowest on record.

As a result, the share of lost workday cases that involved only restricted work activity has risen from 17 percent in 1990 to 36 percent in 1997. Conversely, those requiring days away from work have made up a declining share of lost workday cases.