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KWAN ET AL.
RISK OF NOISE-INDUCED HEARING LOSS FOR ORTHOPAEDIC SURGEONS
http://dx.doi.org/10.2106/JBJS.22.00582 Page 1
The following content was supplied by the authors as supporting material and has not been copy-edited or verified by JBJS.
Appendix 1. Graphical proofs of assumptions for generalized linear model regressions
Figure 2. Checking Linearity Assumption Figure 1. Checking Normality Assumption
Figure 3. Checking Independence Assumption
COPYRIGHT © BY THE JOURNAL OF BONE AND JOINT SURGERY,INCORPORATED
KWAN ET AL.
RISK OF NOISE-INDUCED HEARING LOSS FOR ORTHOPAEDIC SURGEONS
http://dx.doi.org/10.2106/JBJS.22.00582 Page 2
Figure 4. Checking multicollinearity Assumption with VIF
Figure 5. Checking for Homoscedasticity Assumption
COPYRIGHT © BY THE JOURNAL OF BONE AND JOINT SURGERY,INCORPORATED
KWAN ET AL.
RISK OF NOISE-INDUCED HEARING LOSS FOR ORTHOPAEDIC SURGEONS
http://dx.doi.org/10.2106/JBJS.22.00582 Page 3
Appendix 2. Histograms of transformations for time weighted average (TWA) demonstrating distributions
COPYRIGHT © BY THE JOURNAL OF BONE AND JOINT SURGERY,INCORPORATED
KWAN ET AL.
RISK OF NOISE-INDUCED HEARING LOSS FOR ORTHOPAEDIC SURGEONS
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Appendix 3. Average maximum decibel level, time weight average (TWA), dose and projected dose for the most frequently performed orthopaedic procedures; total hip arthroplasty (THA), total knee arthroplasty (TKA), ankle open reduction internal fixation (ORIF), distal radius ORIF, total shoulder arthroplasty (anatomic/reverse; TSA), anterior cervical discectomy and fusion (ACDF),
laminectomy, anterior cruciate ligament reconstruction (ACL), shoulder arthroscopy, and knee arthroscopy.
THA TKA Ankle ORIF
Distal Radius
ORIF
TSA/
RTSA
ACDF Laminectomy ACL Shoulder Arthroscopy
Knee Arthroscopy
N=13 N=31 N=6 N=8 N=28 N=13 N=8 N=13 N=10 N=16
Max dB level (dB)
103 (2.9)
102 (2.8)
98.6
(2.9) 93.2 (2.3)
101 (3.6)
101
(4.3) 99.6 (5.1)
95.6
(6.4) 99.4 (3.5) 97.1 (6.1) TWA
(dB)
68.8 (2.8)
69.6 (2.6)
60.4
(2.8) 53.1 (5.1)
63.6 (5.6)
65.7
(4.1) 67.4 (5.1)
55.2
(10.8) 58.2 (5.2) 53.7 (9.9) Dose (%) 2.78
(1.63) 3.42
(2.15) 0.42
(0.31) 0.11
(0.10) 1.23
(1.18) 1.80
(2.06) 3.05 (3.44) 0.38
(0.44) 0.34 (0.31) 0.28 (0.47) Projected
dose (%) 18.7
(11.8) 20.2
(10.8) 3.13
(1.87) 0.59
(0.51) 7.80
(6.78) 10.1
(10.9) 20.9 (22.2) 1.99
(2.46) 2.25 (2.30) 2.25 (2.53)
