condition mean min max ZT0-3 8.625554999999999 8.625554999999999 8.625554999999999 ZT4-7 6.072795 6.072795 6.072795 ZT8-11 5.675314999999999 5.675314999999999 5.675314999999999 ZT12-15 5.989039999999999 5.989039999999999 5.989039999999999 ZT16-19 10.46505 10.46505 10.46505 ZT20-23 10.121825000000001 10.121825000000001 10.121825000000001