condition mean min max ZT0-3 62.57655 62.57655 62.57655 ZT4-7 56.6957 56.6957 56.6957 ZT8-11 59.840450000000004 59.840450000000004 59.840450000000004 ZT12-15 64.9762 64.9762 64.9762 ZT16-19 66.57325 66.57325 66.57325 ZT20-23 66.29995 66.29995 66.29995