condition mean min max ZT0-3 41.478594765 33.89039061 49.06679892 ZT4-7 28.1906301975 24.19042433 32.190836065 ZT8-11 41.538098875 34.89531969 48.18087806 ZT12-15 52.24784827 44.912667345 59.583029194999995 ZT16-19 55.51821639 47.70754949 63.32888329 ZT20-23 86.13429857 79.73450106499999 92.53409607500001