condition mean min max ZT0-3 2.2596675 2.240995 2.27834 ZT4-7 6.68899 6.68899 6.68899 ZT8-11 20.9395 20.9395 20.9395 ZT12-15 0 0 0 ZT16-19 13.02305 13.02305 13.02305 ZT20-23 4.133485 4.133485 4.133485