condition mean min max ZT0-3 7.699999999999999 7.699999999999999 7.699999999999999 ZT4-7 407.9 407.9 407.9 ZT8-11 385.75 385.75 385.75 ZT12-15 220.95 220.95 220.95 ZT16-19 27.8 27.8 27.8 ZT20-23 6.65 6.65 6.65