Here are some examples:
Pravda.RU Accident rate for aeroplanes in Russia lower than ...
... 10:59 2001-07-06 ACCIDENT RATE FOR AEROPLANES IN RUSSIA LOWER THAN USA As expected,
the western press had a field day at the expense of the 136 victims of the ...
english.pravda.ru/main/2001/07/06/9450.html - 62k - Cached - Similar pages

BBC News | HEALTH | Wonder needle cuts accident rate
... Monday, 29 January, 2001, 00:18 GMT Wonder needle cuts accident rate Syringes cause
more injuries than other equipment The introduction of safer syringes has ...
news.bbc.co.uk/hi/english/health/newsid_1138000/1138033.stm - 25k - Cached - Similar pages

Industrial accident rate still high
... .. Industrial accident rate still high. Download article
in original language Five years after ...
www.eiro.eurofound.ie/2001/06/features/ES0106147F.html - 17k - Cached - Similar pages

Strike in Catalonia and Basque Country against industrial ...
... .. Strike in Catalonia and Basque Country against industrial
accident rate. Download article ...
www.eiro.eurofound.ie/2001/05/inbrief/ES0105241N.html - 10k - Cached - Similar pages
[ More results from www.eiro.eurofound.ie ]

pepele
... AND. REDUCING THE ACCIDENT RATE. A Consensus for
Change. December 1997. December 11, 1997. Honorable ...
www.faa.gov/ncarc/reports/pepele.htm - 101k - Cached - Similar pages

Summary Report FHWA RD-93-046
... the effects of median width and several other roadway variables on the accident
rate. This model assumes that the effect of variables on the accident rate is ...
www.tfhrc.gov/humanfac/rd93-046/rd93-046.htm - 10k - Cached - Similar pages

Comtrak scores with low accident rate - 2001-06-25 - Memphis ...
... conference. ... Breaking News. June 25, 2001 Comtrak scores
with low accident rate. Memphis ...
memphis.bcentral.com/memphis/stories/2001/06/25/daily6.html - 34k - Cached - Similar pages

In-Vehicle Technologies: Experience & Research
... Police accident rate using radios 7/10/00 8:58:49 PM Michael Obradovich Automotive
Industry OEM/Supplier Refering to: Issues in the Evaluation of Driver ...
www-nrd.nhtsa.dot.gov/departments/nrd-13/driver-distraction/ Topics013020281.htm - 23k - Cached - Similar pages

US 195 Corridor Safety Study - Accident Rate

Siendo "casualty" término de uso común en el ámbito de los seguros, lo sugiero.

Claim is also used for siniestros.
Good luck!

Hope this helps. Good luck!

Yo utilizaría "disaster ratio", pues me parece la más precisa y es la primera que me viene a la mente por ser la más amplia.
Ver por ejemplo: http://www.chron.com/cs/CDA/story.hts/business/barlow/957224
June 30, 2001, 6:13PM

To be prepared, close floodgates
By JIM BARLOW
Copyright 2001 Houston Chronicle

Back in elementary school they taught me the 16-to-1 disaster ratio. Remember, an ounce of prevention is worth a pound of cure?

The flooding from Tropical Storm Allison revealed a lot of people didn't learn it. They failed to anticipate the worst.

The definition depends on the context of the phrase, but is probably more commonly used to simply denote the "loss record" of an Assured.

I have nearly 20 years' experience in international insurance broking, the majority of which has been in Latin American or Spanish business.

This is not the loss ratio but rather total number of claims or event losses.

Loss ratio would índice / coeficiente de siniestralidad or coeficiente de pérdidas as used in Spanish insurance speak.