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Figure 4: Statistical distributions of hearing threshold levels (HTLs) in call center operators and unscreened Swedish (a), Norwegian (b), and United States (c) populations according to ISO 1999:2013.[16] Data are given as 10th/50th/90th percentiles. Rhombus and whiskers represent call center operators, whereas solid lines represent reference populations

Figure 4: Statistical distributions of hearing threshold levels (HTLs) in call center operators and unscreened Swedish (a), Norwegian (b), and United States (c) populations according to ISO 1999:2013.<sup>[16]</sup> Data are given as 10th/50th/90th percentiles. Rhombus and whiskers represent call center operators, whereas solid lines represent reference populations