condition mean min max ZT0-3 2.2272775 2.22578 2.228775 ZT4-7 2.19745 2.19745 2.19745 ZT8-11 4.4737849999999995 4.4737849999999995 4.4737849999999995 ZT12-15 0 0 0 ZT16-19 8.78169 8.78169 8.78169 ZT20-23 0.0 0.0 0.0