condition mean min max ZT0-3 15.206899 15.206899 15.206899 ZT4-7 14.539473000000001 14.539473000000001 14.539473000000001 ZT8-11 11.343862 11.343862 11.343862 ZT12-15 13.191414 13.191414 13.191414 ZT16-19 12.5120275 12.5120275 12.5120275 ZT20-23 11.9762205 11.9762205 11.9762205