condition mean min max ZT0-3 135.47492 135.47492 135.47492 ZT4-7 86.6689465 86.6689465 86.6689465 ZT8-11 109.381719 109.381719 109.381719 ZT12-15 157.912991 157.912991 157.912991 ZT16-19 177.811219 177.811219 177.811219 ZT20-23 126.069527 126.069527 126.069527