condition mean min max ZT0-3 1.21419375 0.9751924999999999 1.453195 ZT4-7 0.4218965 0.4218965 0.4218965 ZT8-11 0.1746175 0.1746175 0.1746175 ZT12-15 0 0 0 ZT16-19 0.838587 0.838587 0.838587 ZT20-23 0.47898299999999994 0.47898299999999994 0.47898299999999994