condition mean min max ZT0-3 0.3622768 0.0810324 0.6420865 ZT4-7 0.34059449999999997 0.34059449999999997 0.34059449999999997 ZT8-11 0.19650499999999999 0.19650499999999999 0.19650499999999999 ZT12-15 0.54115475 0.512004 0.5703055 ZT16-19 0.26216300000000003 0.26216300000000003 0.26216300000000003 ZT20-23 0.461209 0.461209 0.461209