condition mean min max ZT0-3 533.974849 533.974849 533.974849 ZT4-7 954.4791585 954.4791585 954.4791585 ZT8-11 789.950195 789.950195 789.950195 ZT12-15 734.718005 734.718005 734.718005 ZT16-19 605.4712334999999 605.4712334999999 605.4712334999999 ZT20-23 487.5902375 487.5902375 487.5902375