SAFETY PERFORMANCE INDICATORS
1. FREQUENCY RATE
2. FATAL ACCIDENT FREQUENCY RATE
3. PERCENTAGE REDUCTION IN FREQUENCY RATE(PRFR)
4. WEIGHTED FREQUENCY RATE
5. SAFE T-SCORE
6. INCIDENCE RATE
7. SEVERITY RATE
8. MEAN DURATION RATE
9. DURATION RATE
10. DISABLING INJURY INDEX
FREQUENCY RATE
A question 'How often do injuries occur?' is
replied by the frequency rate which is defined as the disabling (lost time)
injuries per 106 man-hours worked.
F1
= No. of lost time injury x
106
Manhours worked
FR
= No. of lost time injury x
106
Manhours worked
If the injury does not cause loss of time in
the period in which it occurs but in a subsequent period the injury should be
included in the frequency rate of the period in which the loss of time begins.
If an injury causes intermittent loss of time,
it should only be included in the frequency rate once that is, when the first
loss of time occurs.
Since frequency rate F, is based on the lost
time injuries reportable to the statutory authorities, it ma) be used for
official purposes only. In all other cases frequency rate F, should be used for
comparison purposes.
In some country, the frequency coefficient (F)
h determined by
F
= No. of injuries for a
given period x 1000
Total Man – hours of exposureFATAL ACCIDENT FREQUENCY RATE
It indicates fatalities per 108 man-hours
worked. It is the number of deaths from industrial injuries expected in a group
of IOQO people during their working lives (1000 x 40 years x 52 weeks x 48
hours = 1000 x 40 x50x
50 = 108)
FAFR
of chemical Industry
|
FAFR
in UK Of
|
France - 8.5
West Germany - 5
UK - 4
USA - 5
|
Chemical Ind. - 4
Steel Ind. - 8
Coal Mining - 40
Air Crew - 250
|
FAFR for non-industrial
activities
|
|
Staying at home - 3
Travelling by bus - 3
Travelling by car - 57
Traveling by air - 240
Motor cycling - 660
Rock climbing - 4000
|
|
PERCENTAGE REDUCTION IN FREQUENCY RATE(PRFR)
PRFR = Frequency rate now x 100
Frequency rate past
This is used to decide awards. Average PRFR
for two consecutive years is considered.
WEIGHTED FREQUENCY RATE
While giving National Safety Award, this rate : considered and given bv -
WFR
= (No. of fatal accidents x
10) x 106
Total man – hours worked
+ (No. of permanent total dis – abilities
x 10) x 106
Total man – hours worked
+ (No. of Nonfatal Accidents) x 106
Total man – hours
worked
Here each fatal accident and permanent total
disability are equated with 10 non-fatal accidents.
SAFE T-SCORE
It is given by
SafeT-Score
=
Frequency rate now – Frequency rate past
Frequency rate past x 106
Manhours worked now.
Positive (+) STS indicates a worsening record
while negative (-) STS indicates an improving record over the past.
If STS is It indicates
Between +2 & -2 Change
is not significant. There may be random fluctuation only.
More than +2 Record
is worsening than it was in the past. Something wrong has happened.
Less than – 2 Record is improving
than it was in the past. Something better has happened.
Thus Safe-T-Score is useful to compare our safety record with the past and to control it if it is found worsening.
Thus Safe-T-Score is useful to compare our safety record with the past and to control it if it is found worsening.
INCIDENCE RATE
General incidence rate is the ratio of the number of injuries to the number of employees during the period under review. It is expressed as the number of accidents or injuries, per 1000 persons employed.
IL = No. of lost –time accidents or injuries
x 1000
Average No. of persons
employed
IR = No. of reportable lost time accidents or
injuries x 1000
Average No. of
persons employedSEVERITY RATE
A question 'How serious are the injuries? is
replied by the severity rate which is defined as the number of days of lost
time per 106 man-hours worked.
SL = Mandays lost due to lost time injury x
106
Manhours
worked.
SR = Mandays lost due to reportable lost time
injury x 106
Manhours
worked.
The severity coefficient (S) is determined by
S = Mandays lost in all accidents for a
given period
No. of injuries
for a given period
Since severity rate SR is based on
the lost time injuries reportable to the statutory authorities, it should be
used for official purposes only. In all other cases severity rate SL
should be used for comparison purposes.
MEAN DURATION RATE
It is an average number of days lost per
accident
MDR = Total number of mandays lost
Total number of
accidents
= Severity Rate
Frequency Rate
It
is also called average days charged or average severity per injury and given
by:
Average days charged = Severity Rate
Frequency Rate
Mandays lost per accident = Total days lost or charged
Total no. of disabling injuriesMEAN DURATION RATE
It is an average number of days lost per accident
MDR = Total number of mandays lost
Total number of
accidents
= Severity Rate
Frequency Rate
It
is also called average days charged or average severity per injury and given
by:
Average days charged = Severity Rate
Frequency Rate
Mandays lost per accident = Total days lost or charged
Total no. of disabling injuries
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