condition mean min max ZT0-3 0.5992375 0.3341795 0.7848839999999999 ZT4-7 0.4379575 0.4379575 0.4379575 ZT8-11 0.9806925 0.9806925 0.9806925 ZT12-15 1.0547725 1.0372405 1.0723045 ZT16-19 2.164985 2.164985 2.164985 ZT20-23 2.136345 2.136345 2.136345