condition mean min max ZT0-3 13.35 13.35 13.35 ZT4-7 6.0 6.0 6.0 ZT8-11 5.8 5.8 5.8 ZT12-15 25.200000000000003 25.200000000000003 25.200000000000003 ZT16-19 54.25 54.25 54.25 ZT20-23 26.9 26.9 26.9