condition mean min max ZT0-3 98.95913 98.95913 98.95913 ZT4-7 223.690361 223.690361 223.690361 ZT8-11 410.27807 410.27807 410.27807 ZT12-15 373.1111545 373.1111545 373.1111545 ZT16-19 146.4060275 146.4060275 146.4060275 ZT20-23 60.054603 60.054603 60.054603