condition mean min max ZT0-3 12.607050000000001 12.607050000000001 12.607050000000001 ZT4-7 12.7972 12.7972 12.7972 ZT8-11 11.5115 11.5115 11.5115 ZT12-15 11.107915 11.107915 11.107915 ZT16-19 12.501100000000001 12.501100000000001 12.501100000000001 ZT20-23 12.54735 12.54735 12.54735