condition mean min max ZT0-3 24.8566 24.8566 24.8566 ZT4-7 19.1796 19.1796 19.1796 ZT8-11 18.742649999999998 18.742649999999998 18.742649999999998 ZT12-15 21.79505 21.79505 21.79505 ZT16-19 24.329900000000002 24.329900000000002 24.329900000000002 ZT20-23 23.87565 23.87565 23.87565