condition mean min max ZT0-3 20.514633333333332 15.46555 24.2209 ZT4-7 17.05135 17.05135 17.05135 ZT8-11 12.964 12.964 12.964 ZT12-15 17.576349999999998 16.06605 19.08665 ZT16-19 16.22225 16.22225 16.22225 ZT20-23 23.699150000000003 23.699150000000003 23.699150000000003