How do these Scalability Settings work?

I have no idea how this works and what these numbers mean, if this is something like a performance index (benchmarking points 18-115) how do i read it out what my system has for a performance setting?

[ScalabilitySettings]
PerfIndexThresholds_ResolutionQuality=“GPU 18 42 115”
PerfIndexThresholds_ViewDistanceQuality=“Min 18 42 105”
PerfIndexThresholds_AntiAliasingQuality=“GPU 18 42 115”
PerfIndexThresholds_ShadowQuality=“Min 18 42 105”
PerfIndexThresholds_PostProcessQuality=“GPU 18 42 115”
PerfIndexThresholds_TextureQuality=“GPU 18 42 115”
PerfIndexThresholds_EffectsQuality=“Min 18 42 105”
PerfIndexThresholds_FoliageQuality=“GPU 18 42 115”