condition mean min max ZT0-3 72.87585 72.87585 72.87585 ZT4-7 55.37665 55.37665 55.37665 ZT8-11 49.0185 49.0185 49.0185 ZT12-15 53.24335 53.24335 53.24335 ZT16-19 80.53110000000001 80.53110000000001 80.53110000000001 ZT20-23 80.434 80.434 80.434