condition mean min max ZT0-3 19.112325000000002 18.35 19.874650000000003 ZT4-7 14.0899 14.0899 14.0899 ZT8-11 16.23345 16.23345 16.23345 ZT12-15 0 0 0 ZT16-19 17.201999999999998 17.201999999999998 17.201999999999998 ZT20-23 16.667250000000003 16.667250000000003 16.667250000000003