K
knutinh
Gjest
http://www.acoustics.org/press/151st/Murphy.html
"...
Over the period 1971-1975, NHANES I tested hearing in a nationally-representative sample of Americans aged 25-75 years. Although the survey was periodically repeated, hearing testing of adults was not included again until 1999-2004, when NHANES tested hearing levels of US adults aged 20-69 years.
...
The following three figures illustrate mean hearing thresholds across all sound frequencies (or pitches) tested in the current NHANES by gender and race. Frequencies (measured in hertz [Hz] are represented horizontally across the graphs with low pitches on the left and increasingly higher pitches on the right (similar to playing on the left side of a piano and gradually moving to the right side). Hearing level (measured in decibels [dB] is represented vertically down the side of the graph, with softer sounds towards the top and louder sounds farther down. Conversational speech is between 500 Hz and 3000 Hz with a sound level between 50 and 60 dB.
Figure 1. Mean U.S. hearing thresholds by ear and gender for US adults age 20-29, NHANES 1999-2004.
Figure 3. Mean hearing thresholds for males age 20-69 by ear and race/ethnicity, NHANES 1999-2004."
Interessant at hvite menn har såpass mye større tap av hørsel enn sorte. Er det gener eller bruk av walkman/støy på arbeidsplass?
-k
"...
Over the period 1971-1975, NHANES I tested hearing in a nationally-representative sample of Americans aged 25-75 years. Although the survey was periodically repeated, hearing testing of adults was not included again until 1999-2004, when NHANES tested hearing levels of US adults aged 20-69 years.
...
The following three figures illustrate mean hearing thresholds across all sound frequencies (or pitches) tested in the current NHANES by gender and race. Frequencies (measured in hertz [Hz] are represented horizontally across the graphs with low pitches on the left and increasingly higher pitches on the right (similar to playing on the left side of a piano and gradually moving to the right side). Hearing level (measured in decibels [dB] is represented vertically down the side of the graph, with softer sounds towards the top and louder sounds farther down. Conversational speech is between 500 Hz and 3000 Hz with a sound level between 50 and 60 dB.
Figure 1. Mean U.S. hearing thresholds by ear and gender for US adults age 20-29, NHANES 1999-2004.
Figure 3. Mean hearing thresholds for males age 20-69 by ear and race/ethnicity, NHANES 1999-2004."
Interessant at hvite menn har såpass mye større tap av hørsel enn sorte. Er det gener eller bruk av walkman/støy på arbeidsplass?
-k