condition mean min max ZT0-3 26.262500000000003 26.262500000000003 26.262500000000003 ZT4-7 30.0252 30.0252 30.0252 ZT8-11 21.608600000000003 21.608600000000003 21.608600000000003 ZT12-15 21.92805 21.92805 21.92805 ZT16-19 20.31695 20.31695 20.31695 ZT20-23 22.6727 22.6727 22.6727