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Table 2 The subjects' speech intelligibility with and without HPDs at S/N =  + 5

From: The effect of hearing protection devices on speech intelligibility of Persian employees

HPDs types With HPDs (%) Without HPDs (%) p value Difference (%)
Earplug A1 74.13 ± 4.40 72.00 ± 2.70 0.15 2.13
Earplug A2 72.80 ± 2.10 72.00 ± 2.70 0.71 0.80
Earplug A3 72.10 ± 1.10 72.00 ± 2.70 0.70 0.10
Earmuff B1 73.87 ± 5.60 72.00 ± 2.70 0.10 1.87
Earmuff B2 72.00 ± 5.20 72.00 ± 2.70 0.41 0.00
Earmuff B3 72.00 ± 2.20 72.00 ± 2.70 0.90 0.00
Prototype earplug 75.60 ± 3.60 72.00 ± 2.70 0.10 3.60