ADVANCES IN EXPOSURE PREVENTION—Vol. 6, No. 1, 2002 7Using Denominators to CalculatePercutaneous Injury RatesBy Janine Jagger, M.P.H., Ph.D.THE DATA THAT HEALTH CARE FACILITIES COLLECT IN SHARPS time nurses, they count as 25 full time equivalent nurses.injury logs can be used to calculate needlestick rates and This method gives a more accurate denominator than sim to make comparisons among different professional groups, ply counting the number of nurses employed. For somedevice categories, and hospital settings. Rates consist of occupational categories it may be difficult or simply im a numerator and a denominator; in the three methods of possible to calculate an accurate rate. For instance, in somerate calculation that follow, the numerator always con hospitals, contract workers who provide services such assists of the number of needlesticks that occurred in a spe phlebotomy are technically not considered employees ofcific time period. The denominator is either the number the hospital. If those workers report their injuries to theirof occupied beds, the number of full time equivalent (FTE) contracting agency, the hospital may not have a record ofemployees in a specific job category, or the number of all or any of their incidents. Furthermore, in many privatedevices in a given device category used in a given time hospitals physicians are not employed by the hospital theyperiod. The time period corresponding to the numerator practice in, and their injuries ...