Mean power frequency, Hz0−<20th percentile
<0.001≤−<0.23
20th≤−40th percentile
0.23≤−0.24
40th≤−60th percentile
0.24≤−0.27
60th≤−80th percentile
0.27≤−0.29
80th≤−≤100th percentile
0.29≤−0.45
Total
CTS, number of cases89711171068194118116834
Person years936 9381 179 089924 3131 258 2791 078 3085 376 927
IR*9.69.511.615.416.812.7
IRR, crude1.00 (ref.)0.99 (0.91 to 1.08)1.21 (1.10 to 1.32)1.61 (1.49 to 1.74)1.75 (1.62 to 1.90)
IRR, adjusted†1.00 (ref.)0.78 (0.72 to 0.86)1.51 (1.37 to 1.66)1.33 (1.23 to 1.44)1.83 (1.68 to 1.98)