Figure 2
From: Hyperbaric oxygen upregulates cochlear constitutive nitric oxide synthase
Auditory level. Box plots of the hearing level in the control, normobaric air (NBA) group and the experimental, hyperbaric oxygen (HBO) treatment group before (_pre) and 4 weeks after (_4w) the treatment sessions. There were no significant intra-group changes or inter-group differences in the hearing levels before and 4 weeks after the start of the treatment. X-axis indicates the different frequencies for auditory measurement, from 1 k to 8 k Hz. The dots represent the outliers.