condition mean min max ZT0-3 88.474925 82.7251 94.22475 ZT4-7 95.6861 95.6861 95.6861 ZT8-11 102.4331 102.4331 102.4331 ZT12-15 0 0 0 ZT16-19 108.938 108.938 108.938 ZT20-23 101.0358 101.0358 101.0358