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. 2023 Mar 29;131(3):037013. doi: 10.1289/EHP11587

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Figure 2 is a set of three line graphs, where the first two graphs plot hazard ratio ranging from 1.00 to 1.30 in increments of 0.05 (y-axis) across road traffic noise open parenthesis day evening night level open brackets decibel closed bracket closed parenthesis ranging from 40 to 70 in increments of 10 (x-axis) and railway noise open parenthesis day evening night level open bracket decibel closed bracket closed parenthesis ranging from 30 to 80 in increments of 10 (x-axis) respectively. The third graph plots hazard ratio ranging from 1.00 to 1.15 in increments of 0.05 (y-axis) across aircraft noise open parenthesis day evening night level open bracket decibel closed bracket closed parenthesis ranging from 30 to 55 in increments of 5 (x-axis). — Exposure–response relationships for the association between transportation noise source [Lden (dB)] and mortality from intentional self-harm (ICD-10: X60–84, excl. ICD-10 X61.8, X61.9, X81–82). Natural splines (3 df, knots placed at tertiles of noise distribution) for the association between road traffic, railway, or aircraft noise (Lden, dB) and mortality from all intentional self-harm (ICD-10: X60–84, excluding ICD-10 X61.8, X61.9, X81–82). Same adjustments as in main model (M3), including noise exposures (road traffic noise, railway noise, and aircraft noise), $particulate matter begin subscript 2.5 end subscript$ exposure, NDVI within 500 m around the residence, age as timescale, sex as strata, individual sociodemographic covariates (civil status, education, mother tongue, nationality, urbanization, local SEP, area SEP, and unemployment rate) were used. Vertical dashed red lines show source-specific WHO guideline levels: $road traffic equals 53 decibels$ , $railway equals 54 decibels$ , $aircraft equals 45 decibels$ . (For interpretation of the references to color in this figure legend, see the web version of this article.) Internal knots placed at the following values (tertiles of respective noise distribution): road traffic noise: 50.64 dB, 57.84 dB; railway noise: 30 dB (lower bound and first tertile), 39.66 dB; aircraft noise: 30 dB (lower bound and first tertile), 32.62 dB. Mean and SD of the noise distribution can be found in Table 2. HR and 95% CI at Lden values indicated on the x-axis can be found in Table S9A–C. Note: CI, confidence interval; dB, decibel; df, degrees of freedom; HR, hazard ratio; ICD, International Statistical Classification of Diseases and Related Health Problems, 10th Revision; Lden, day-evening-night level; NDVI, normalized difference vegetation index; SD standard deviation; SEP, socioeconomic position; WHO, World Health Organization.