condition mean min max ZT0-3 3.5916699999999997 1.944605 5.238734999999999 ZT4-7 0.0 0.0 0.0 ZT8-11 1.977955 1.977955 1.977955 ZT12-15 0 0 0 ZT16-19 1.93148 1.93148 1.93148 ZT20-23 3.879875 3.879875 3.879875