condition mean min max ZT0-3 34.731700000000004 28.298650000000002 41.16475 ZT4-7 32.8862 32.8862 32.8862 ZT8-11 28.54155 28.54155 28.54155 ZT12-15 0 0 0 ZT16-19 28.950850000000003 28.950850000000003 28.950850000000003 ZT20-23 30.3302 30.3302 30.3302