condition mean min max ZT0-3 9.915712500000001 7.175575 12.655850000000001 ZT4-7 17.9862 17.9862 17.9862 ZT8-11 8.986139999999999 8.986139999999999 8.986139999999999 ZT12-15 0 0 0 ZT16-19 7.102415000000001 7.102415000000001 7.102415000000001 ZT20-23 17.8482 17.8482 17.8482