condition mean min max ZT0-3 408.901232 408.901232 408.901232 ZT4-7 461.893866 461.893866 461.893866 ZT8-11 474.630024 474.630024 474.630024 ZT12-15 460.5840715 460.5840715 460.5840715 ZT16-19 532.8356679999999 532.8356679999999 532.8356679999999 ZT20-23 557.0365075 557.0365075 557.0365075