condition mean min max ZT0-3 23.8256703025 22.777834665 24.87350594 ZT4-7 17.25427582 15.101592315000001 19.406959325 ZT8-11 16.318739795 16.2095558 16.42792379 ZT12-15 8.566823819749999 7.455965512 9.677682127499999 ZT16-19 8.07265037525 6.8453809175 9.299919833 ZT20-23 14.881323785 13.157679885 16.604967685