condition mean min max ZT0-3 59.216238 59.216238 59.216238 ZT4-7 292.044857 292.044857 292.044857 ZT8-11 974.067256 974.067256 974.067256 ZT12-15 476.9362075 476.9362075 476.9362075 ZT16-19 612.9998860000001 612.9998860000001 612.9998860000001 ZT20-23 441.597381 441.597381 441.597381