condition mean min max ZT0-3 90.685629 90.685629 90.685629 ZT4-7 129.9444375 129.9444375 129.9444375 ZT8-11 71.36602450000001 71.36602450000001 71.36602450000001 ZT12-15 84.9123185 84.9123185 84.9123185 ZT16-19 42.836456999999996 42.836456999999996 42.836456999999996 ZT20-23 19.281599 19.281599 19.281599