condition mean min max ZT0-3 173.508036 173.508036 173.508036 ZT4-7 168.146099 168.146099 168.146099 ZT8-11 130.8632185 130.8632185 130.8632185 ZT12-15 119.8840535 119.8840535 119.8840535 ZT16-19 116.9612295 116.9612295 116.9612295 ZT20-23 115.06950800000001 115.06950800000001 115.06950800000001