condition mean min max ZT0-3 25.677642 25.677642 25.677642 ZT4-7 25.864183 25.864183 25.864183 ZT8-11 25.951605 25.951605 25.951605 ZT12-15 22.350739 22.350739 22.350739 ZT16-19 21.857549 21.857549 21.857549 ZT20-23 22.001165999999998 22.001165999999998 22.001165999999998