condition mean min max ZT0-3 22.067875 20.10805 24.0277 ZT4-7 31.9861 31.9861 31.9861 ZT8-11 26.272 26.272 26.272 ZT12-15 0 0 0 ZT16-19 28.158900000000003 28.158900000000003 28.158900000000003 ZT20-23 30.000149999999998 30.000149999999998 30.000149999999998