condition mean min max ZT0-3 2.2741350000000002 1.85603 2.69224 ZT4-7 1.05322 1.05322 1.05322 ZT8-11 0.3471245 0.3471245 0.3471245 ZT12-15 0 0 0 ZT16-19 2.072085 2.072085 2.072085 ZT20-23 1.389015 1.389015 1.389015