condition mean min max ZT0-3 60.639272 60.639272 60.639272 ZT4-7 49.2662375 49.2662375 49.2662375 ZT8-11 67.0648265 67.0648265 67.0648265 ZT12-15 93.16893250000001 93.16893250000001 93.16893250000001 ZT16-19 172.24352499999998 172.24352499999998 172.24352499999998 ZT20-23 159.77417350000002 159.77417350000002 159.77417350000002