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Why do the guideline weights shown in figure 22 of the MHOR (L23) differ from those shown in the load/frequency graph in MAC?

April 26, 2017differ figure Frequency guideline load weights

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Why do the guideline weights shown in figure 22 of the MHOR (L23) differ from those shown in the load/frequency graph in MAC?

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A. The figures in L23 and the lifting graph in the MAC are based on the same data set (Snook and Ciriello, 91), but have different uses. The figures in L23 are designed to inform the user of when a more detailed assessment is required and uses data that will provide a reasonable level of protection to 95% of the working population. The MAC is designed to help the user identify high risk manual handling operations. The load/frequency graph has been included to show how load, weight and repetition affect the degree of risk during manual handling. This is based on the lifting capabilities of the working population.