condition mean min max ZT0-3 9.75 9.75 9.75 ZT4-7 14.7 14.7 14.7 ZT8-11 36.8 36.8 36.8 ZT12-15 83.95 83.95 83.95 ZT16-19 66.30000000000001 66.30000000000001 66.30000000000001 ZT20-23 71.19999999999999 71.19999999999999 71.19999999999999