condition mean min max ZT0-3 31.728699999999996 31.728699999999996 31.728699999999996 ZT4-7 18.06755 18.06755 18.06755 ZT8-11 6.06008 6.06008 6.06008 ZT12-15 11.4367 11.4367 11.4367 ZT16-19 52.3601 52.3601 52.3601 ZT20-23 50.91585 50.91585 50.91585