condition mean min max ZT0-3 38.541587892500004 36.733620285 40.3495555 ZT4-7 23.204909807499998 20.022164665 26.387654949999998 ZT8-11 34.4919678975 28.908145974999996 40.07578982 ZT12-15 18.97739037 10.645007235 27.309773505 ZT16-19 14.93667467 14.933065355 14.940283985 ZT20-23 15.2551667825 14.108697345 16.40163622