condition mean min max ZT0-3 263.528293 263.528293 263.528293 ZT4-7 340.73584800000003 340.73584800000003 340.73584800000003 ZT8-11 350.586633 350.586633 350.586633 ZT12-15 348.70392749999996 348.70392749999996 348.70392749999996 ZT16-19 354.5148265 354.5148265 354.5148265 ZT20-23 280.262375 280.262375 280.262375