condition mean min max ZT0-3 4.326155 4.230235 4.422075 ZT4-7 6.264245 6.264245 6.264245 ZT8-11 3.016695 3.016695 3.016695 ZT12-15 0 0 0 ZT16-19 3.454205 3.454205 3.454205 ZT20-23 4.569509999999999 4.569509999999999 4.569509999999999