condition mean min max ZT0-3 10.727022 10.727022 10.727022 ZT4-7 10.5859345 10.5859345 10.5859345 ZT8-11 10.4973435 10.4973435 10.4973435 ZT12-15 10.5794615 10.5794615 10.5794615 ZT16-19 10.167247 10.167247 10.167247 ZT20-23 12.2020435 12.2020435 12.2020435