condition mean min max ZT0-3 0.5495034999999999 0.327311 0.7716959999999999 ZT4-7 2.946025 2.946025 2.946025 ZT8-11 1.343325 1.343325 1.343325 ZT12-15 0 0 0 ZT16-19 1.51307 1.51307 1.51307 ZT20-23 1.1979125 1.1979125 1.1979125