condition mean min max ZT0-3 1025.732057 1025.732057 1025.732057 ZT4-7 557.955352 557.955352 557.955352 ZT8-11 468.925815 468.925815 468.925815 ZT12-15 555.202968 555.202968 555.202968 ZT16-19 693.8424950000001 693.8424950000001 693.8424950000001 ZT20-23 729.8464715 729.8464715 729.8464715