condition mean min max ZT0-3 24.70495 24.70495 24.70495 ZT4-7 20.427100000000003 20.427100000000003 20.427100000000003 ZT8-11 22.81305 22.81305 22.81305 ZT12-15 23.1294 23.1294 23.1294 ZT16-19 26.263849999999998 26.263849999999998 26.263849999999998 ZT20-23 23.2603 23.2603 23.2603