condition mean min max ZT0-3 143.994354 143.994354 143.994354 ZT4-7 145.239325 145.239325 145.239325 ZT8-11 159.058314 159.058314 159.058314 ZT12-15 171.3293675 171.3293675 171.3293675 ZT16-19 201.1278815 201.1278815 201.1278815 ZT20-23 210.652739 210.652739 210.652739