condition mean min max ZT0-3 15.024600000000001 13.3977 16.553150000000002 ZT4-7 18.64885 18.64885 18.64885 ZT8-11 19.5223 19.5223 19.5223 ZT12-15 22.647075 21.85055 23.4436 ZT16-19 17.78485 17.78485 17.78485 ZT20-23 8.768165 8.768165 8.768165