condition mean min max ZT0-3 433.223275 433.223275 433.223275 ZT4-7 304.861224 304.861224 304.861224 ZT8-11 245.726764 245.726764 245.726764 ZT12-15 250.42958900000002 250.42958900000002 250.42958900000002 ZT16-19 203.29807449999998 203.29807449999998 203.29807449999998 ZT20-23 164.225644 164.225644 164.225644