condition mean min max ZT0-3 11.148038178499998 9.211972127 13.08410423 ZT4-7 15.488199275 15.412556930000001 15.56384162 ZT8-11 15.435987839500001 14.459539485666667 16.412436193333335 ZT12-15 21.954610565000003 21.59550962 22.31371151 ZT16-19 22.578426485 22.355701133333334 22.801151836666666 ZT20-23 23.381709558333334 23.11166306 23.651756056666667