condition mean min max ZT0-3 26.329802 26.329802 26.329802 ZT4-7 26.1467 26.1467 26.1467 ZT8-11 28.343731 28.343731 28.343731 ZT12-15 32.354076 32.354076 32.354076 ZT16-19 29.882221 29.882221 29.882221 ZT20-23 35.510951000000006 35.510951000000006 35.510951000000006