condition mean min max ZT0-3 16.129800000000003 16.129800000000003 16.129800000000003 ZT4-7 12.122800000000002 12.122800000000002 12.122800000000002 ZT8-11 14.26245 14.26245 14.26245 ZT12-15 20.19295 20.19295 20.19295 ZT16-19 26.591549999999998 26.591549999999998 26.591549999999998 ZT20-23 20.10135 20.10135 20.10135