condition mean min max ZT0-3 253.448122 253.448122 253.448122 ZT4-7 309.1525315 309.1525315 309.1525315 ZT8-11 349.721001 349.721001 349.721001 ZT12-15 344.5500895 344.5500895 344.5500895 ZT16-19 321.48873100000003 321.48873100000003 321.48873100000003 ZT20-23 288.8941985 288.8941985 288.8941985