condition mean min max ZT0-3 240.5105 186.0235 294.9975 ZT4-7 48.959500000000006 48.959500000000006 48.959500000000006 ZT8-11 31.03895 31.03895 31.03895 ZT12-15 0 0 0 ZT16-19 127.86500000000001 127.86500000000001 127.86500000000001 ZT20-23 131.417 131.417 131.417