condition mean min max ZT0-3 26.200000000000003 26.200000000000003 26.200000000000003 ZT4-7 14.2 14.2 14.2 ZT8-11 14.05 14.05 14.05 ZT12-15 12.85 12.85 12.85 ZT16-19 13.85 13.85 13.85 ZT20-23 12.7 12.7 12.7