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. 2016 Jan 12;11(1):e0146608. doi: 10.1371/journal.pone.0146608

Fig 4. Effect of smoking on PTA threshold at high frequencies.

Fig 4

In the analysis of hearing threshold at high frequencies, hearing thresholds were elevated in the current smoking group compared to those in the passive smoking group and non- smoking group, across all ages. Additionally, the passive smoking group had significantly higher hearing thresholds than the non- smoking group in the 30s (12.4dB in the passive smoking vs 10.5dB in the non-smoking groups; *p = 0.0116) and the 40s (19.6dB in the passive smoking vs 16.4dB in the non-smoking groups; *p < 0.0001) age-groups.