condition mean min max ZT0-3 4.944520000000001 2.382485 7.5065550000000005 ZT4-7 14.6375 14.6375 14.6375 ZT8-11 6.186249999999999 6.186249999999999 6.186249999999999 ZT12-15 0 0 0 ZT16-19 1.977435 1.977435 1.977435 ZT20-23 4.56964 4.56964 4.56964