condition mean min max ZT0-3 3.382395 2.9671849999999997 3.797605 ZT4-7 3.14793 3.14793 3.14793 ZT8-11 6.668265 6.668265 6.668265 ZT12-15 0 0 0 ZT16-19 6.384445 6.384445 6.384445 ZT20-23 6.089965 6.089965 6.089965