condition mean min max ZT0-3 29.85 29.85 29.85 ZT4-7 4.6 4.6 4.6 ZT8-11 16.25 16.25 16.25 ZT12-15 26.5 26.5 26.5 ZT16-19 25.200000000000003 25.200000000000003 25.200000000000003 ZT20-23 19.05 19.05 19.05