condition mean min max ZT0-3 125.94842591 117.73325772 134.16359409999998 ZT4-7 18.802521467 13.284052865 24.320990069 ZT8-11 26.658232645000002 17.686638414999997 35.629826875000006 ZT12-15 39.199440755 37.890201695 40.508679815 ZT16-19 51.7469272725 48.242800540000005 55.251054005 ZT20-23 61.12349025 58.095223005 64.151757495