condition mean min max ZT0-3 49.324625 44.80865 53.840599999999995 ZT4-7 59.0118 59.0118 59.0118 ZT8-11 51.22725 51.22725 51.22725 ZT12-15 0 0 0 ZT16-19 58.956050000000005 58.956050000000005 58.956050000000005 ZT20-23 52.738600000000005 52.738600000000005 52.738600000000005