Noise measurement equipment used in this study
| Item | Serial number | Calibration date |
| CEL dBadge 2-1 | 1758541 | 14 Apr 2015 |
| CEL dBadge 2-2 | 1758631 | 14 Apr 2015 |
| CEL dBadge 2-3 | 1758665 | 14 Apr 2015 |
| CEL 120/2 calibrator | 0255000 | 14 Apr 2015 |
| Svantek SV977 SLM | 36807 | 26 Mar 2015 |
| Aco 7052E ½” mic | 59384 | 26 Mar 2015 |
| Svantek SV12L pre-amp | 42560 | 26 Mar 2015 |
| Svantek SV33 calibrator | 39679 | 26 Mar 2015 |