condition mean min max ZT0-3 136.737302 136.737302 136.737302 ZT4-7 192.8050895 192.8050895 192.8050895 ZT8-11 203.24460249999998 203.24460249999998 203.24460249999998 ZT12-15 174.38059049999998 174.38059049999998 174.38059049999998 ZT16-19 170.0985265 170.0985265 170.0985265 ZT20-23 152.5012875 152.5012875 152.5012875