Figure 2. Impact of MMA treatment on quality of life as measured by the Sleep Apnea Quality of Life Index (SAQLI).

The left side of the boxes represent the 25^th percentile (lower quartile) and 75^th percentile (upper quartile), which is bisected by the median value; + sign represents the mean value; whiskers are used to represent the upper and lower values within 1.5 interquartile range (IQR) of the upper and lower quartiles respectively; black circle represent outlier values—which are defined as values more than 1.5 IQRs below the lower quartile or above the upper quartile. The results show that the study group perceived a very large improvement in their quality of life following MMA surgery (mean ± SD, 8.9 ± 1.2; median, 9.2; IQR, 8.3 to 10.0) with very minimal negative impact on their quality of life from symptoms that developed following MMA surgery (mean ± SD, 1.4 ± 2.3; median, 0.4; IQR, 0.0 to 1.5).