Figure 6: Dose-response curves of “highly annoyed” percentage (%HA) (“extremely/intolerably annoyed”) and their 95% confi dence intervals (CI) with adjustment for age, gender, and occupation of the householder. The broken line represents the dose-response curve calculated from the pooled data of all respondents. (In the 55–65 dB area, 95% CI could not be calculated by multiple logistic regression analysis, because there was no insensitive resident who was highly annoyed)