condition mean min max ZT0-3 23.72835 23.72835 23.72835 ZT4-7 11.2066 11.2066 11.2066 ZT8-11 13.697099999999999 13.697099999999999 13.697099999999999 ZT12-15 9.292505 9.292505 9.292505 ZT16-19 19.634349999999998 19.634349999999998 19.634349999999998 ZT20-23 17.2272 17.2272 17.2272