condition mean min max ZT0-3 12.50017 12.50017 12.50017 ZT4-7 11.668026999999999 11.668026999999999 11.668026999999999 ZT8-11 13.2294765 13.2294765 13.2294765 ZT12-15 15.5852715 15.5852715 15.5852715 ZT16-19 15.959363 15.959363 15.959363 ZT20-23 14.158573 14.158573 14.158573