Table 3

Statistical analysis. Analysis of variance concerning threshold differences (left–right) with six between-groups factors: age group, acoustic shocks, military service, disco visits, use of ear protectors and use of the communication headset.

dfFp
Between groups
Age group18.7110.003
 Acoustic shock11.8380.160
 Military service10.1420.707
 Disco visits10.6720.413
 Ear protection11.6540.199
Headset Ear28.685<0.001
Within groups
Frequency25.4730.020
Freq×Age group26.1110.014
  • Significant factors and interactions (×) are expressed in bold.

  • One within-groups factor is the frequency. Analysed were 3, 4 and 6 kHz, which are predominantly affected by noise.