condition mean min max ZT0-3 15.073125000000001 15.033100000000001 15.11315 ZT4-7 16.48775 16.48775 16.48775 ZT8-11 15.2201 15.2201 15.2201 ZT12-15 0 0 0 ZT16-19 15.083549999999999 15.083549999999999 15.083549999999999 ZT20-23 16.8639 16.8639 16.8639