Table 8 may be re-arranged as follows: This tabulation shows that the material acquisition phase has the highest occupational health impacts (slightly more than half the total PDLs), followed by construction, operations and maintenance. The total PDL/MW-yr for SPS ground activities is obtained bv summing the values for occupational injuries and illnesses. Thus The United States national average incidence rate for all industries is 53.3 PDL/100 manyears. Thus, the computed overall SPS incidence rate is 7% higher than the national average. This may be understood by consideration of Table 3, which underlies the computed result. Table 3 indicates that the occupations which involve the highest incidence rates of occupational iniuries and illnesses are: concrete work, primary metals industries, contract constructions, and fabricated metal products. A large part of the total SPS manpower Then the SPS ground incidence rate is equal to The SPS overall PDL incidence rate can be computed from the relation,
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