condition mean min max ZT0-3 72.457217 72.457217 72.457217 ZT4-7 86.646337 86.646337 86.646337 ZT8-11 106.13410400000001 106.13410400000001 106.13410400000001 ZT12-15 102.3038595 102.3038595 102.3038595 ZT16-19 136.2859995 136.2859995 136.2859995 ZT20-23 110.855086 110.855086 110.855086