Figure 2From: The influence of APACHE II score on the average noise level in an intensive care unit: an observational study24-hour trend of the average noise level every 10 minutes (L A e q ,10 m ). The trends were averaged over 55 patients (299 occupied days) and over 134 unoccupied days, respectively. Inverted triangles indicate the time stamps of the daily routine events in the ICU, as listed in Table 1.Back to article page