condition mean min max ZT0-3 32.73545 32.73545 32.73545 ZT4-7 32.6205 32.6205 32.6205 ZT8-11 26.375999999999998 26.375999999999998 26.375999999999998 ZT12-15 30.32285 30.32285 30.32285 ZT16-19 32.3341 32.3341 32.3341 ZT20-23 30.353650000000002 30.353650000000002 30.353650000000002