condition mean min max ZT0-3 19.05 19.05 19.05 ZT4-7 6.9 6.9 6.9 ZT8-11 10.5 10.5 10.5 ZT12-15 12.4 12.4 12.4 ZT16-19 25.599999999999998 25.599999999999998 25.599999999999998 ZT20-23 17.450000000000003 17.450000000000003 17.450000000000003