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For Reynolds numbers greater than 0.1, the drag force needs to be estimated using friction factor.
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Finally, the productivity costs will be estimated using the friction method, which implies that the costs of absenteeism will occur only for a fixed (friction) period ending at the moment that the employee is replaced [ 45].
If differences are observed between the groups in resumption of work, costs of lost productivity will be estimated using the friction – cost method.
Also, as PFMT is much more time consuming for the patients the costs associated to sick leave at work will be estimated using the friction cost method.
Costs of absenteeism from paid work are estimated using the friction cost approach with a friction period of four months and based on the mean age- and sex-specific income of the Dutch population.
Indirect costs caused by production losses were estimated using the friction cost approach, which assumes that costs are limited to the friction period (i.e. the time it takes to find a replacement), and that the decrease in productivity is less than 100% of the time lost at work (i.e. elasticity) [ 18].
20 The productivity costs were estimated using the Friction Cost Approach, which assumes that productivity loss occurs as long as a sick employee is not replaced (the friction period).
Costs of productivity losses are estimated using the friction cost method [ 61].
Costs of reduced ability to work are estimated using the friction costs method, which results in a more realistic estimate than the human capital approach [ 53].
The friction drag is estimated using the classical ITTC formula.
Contact stresses were estimated using the Hertzian contact formula (sliding friction), and through direct measurements of contact areas by SEM (reciprocating sliding).
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