condition mean min max ZT0-3 774.272546 774.272546 774.272546 ZT4-7 603.9537785 603.9537785 603.9537785 ZT8-11 752.5345540000001 752.5345540000001 752.5345540000001 ZT12-15 723.862534 723.862534 723.862534 ZT16-19 879.761776 879.761776 879.761776 ZT20-23 1698.4527090000001 1698.4527090000001 1698.4527090000001