Noise quantification in the intensive care unit of a tertiary care hospital

Figure 2 Diurnal variation in L10, L50, L90 (representing sound levels exceeding 10%, 50%, and 90% of the time, respectively), equivalent continuous noise level, maximum sound level and sound exposure level (Baseline values were defined as the overall mean during stable periods; percentage change reflects deviation relative to baseline). A: L10 - noise levels exceeded for 10% of the time; B: L50 - noise levels exceeded for 50% of the time; C: L90 - noise levels exceeded for 90% of the time; D: Equivalent continuous noise level. The average sound energy over a given time period; E: The highest sound level recorded during the measurement period; F: Sound exposure level is the total energy of a sound event, normalized to 1 second. L10, L50, L90: Representing sound levels exceeding 10%, 50%, and 90% of the time, respectively; LEQ: Equivalent continuous noise level; Lmax: Maximum sound level; SEL: Sound exposure level.