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3: Changes in otoacoustic emissions with personal stereo use, industrial noise exposure and with age
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The bottom four curves compare the effects of different kinds of exposure versus age for males only. Females with negligible personal stereo use and no industrial exposure are shown for reference. Data points represent mean values and error bars indicate plus or minus 1 standard error. |
Sample sizes for males in the four mutually exclusive groups of personal stereo (PS) use and industrial noise exposure | ||||||
| Noise exposure |
| |||||
| Negligible PS, no industrial (PS 0, IND 0) | ||||||
| PS only (PS 1&2, IND 0) | ||||||
| Industrial only (PS 0, IND 1) | ||||||
| PS and industrial (PS 1&2, IND 1) | ||||||
| Total | ||||||
Corresponding sample sizes for females in the PS 0, IND 0 group were: 10-19y, 45; 20-29y, 158; 30-39y, 136; 40-49y, 107; 50-59y, 55. Total, 501. | ||||||
©MJA 1998
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