4. List of included case studies.
| Reference ID | Case studies included in review | |||||
| Number of cases | Type of industry | Country | Interventiona | Measureb | Additional information (number of cases) | |
| Azman 2012 | 1 | mining (1) | USA | retro‐fit | noise level, noise dose | description of noise measurement (1), follow‐up (1) |
| Caillet 2012 | 1 | offshore helicopter (1) | France | all retro‐fit | noise level | description of noise measurement (1), funding (1), conflict of interest (1) |
| Cockrell 2015 | 2 | manufacturing (2) | USA | all retro‐fit | noise level, dose | description of noise measurement (2) |
| Golmohammadi 2014 | 3 | steel industry (3) | Iran | all retro‐fit | noise level, dose | description of noise measurement (3), funding (3), conflict of interest (3) |
| HSE 2013a | 57 | manufacturing (57) | not reported | new 6 retro‐fit 51 |
noise level | ‐ |
| HSE 2015 | 2 | manufacturing (2) | not reported | all retro‐fit | noise level | ‐ |
| Küpper 2013 | 1 | alpine rescue operation (helicopter) (1) | Austria, Switzerland | new | noise level | description of noise measurement, follow‐up, statistical tests used |
| Maling 2016 | 8 | textile (1), paper shredding (1), manufacturing (6) | USA | new 4, retro‐fit 2, both 2 |
noise level | ‐ |
| Morata 2015 | 18 | manufacturing (15), drilling industry (2), mining (1) | not reported | new 5, retro‐fit 11, both 2 |
noise level, dose | description of noise measurement (3) |
| Pan 2016 | 3 | mining (3) | Australia | all retro‐fit | dose | description of noise measurement (2), funding (3), follow‐up (immediate) (3) |
| Thompson 2015 | 5 | mining(5) | USA | all retro‐fit | noise level, dose | description of noise measurement (1), adverse effects: engine over‐heating (1), time of intervention: 2014/2015 (1) |
| Wilson 2016 | 6 | manufacturing (6) | not reported | all retro‐fit | noise level | ‐ |
| Total | 107 | manufacturing (88), mining (10), steel (3), drilling (2), helicopter (2), textile (1), paper shredding (1) | Australia (3), Iran (3), France (1), USA (16), Austria and Switzerland (1), nr (26) | retro‐fit (86), new (16), both (4) | noise level, dose | description of noise measurement (14), funding (7), follow‐up (5), conflict of interest (4), adverse effects (1), time of intervention (1), statistical tests used (1) |
aTypes of intervention: installation of completely new equipment (new), intervention to improve existing equipment (e.g. new parts, additional damping material layers) (retro‐fit), or a combination of new and retro‐fit interventions (both). bNoise level (including time‐weighted averages or sound pressure levels), dose (including calculations according to OSHA, NIOSH, or MSHA PEL specifications).