condition mean min max ZT0-3 3.8373025 3.62996 4.044645 ZT4-7 3.98998 3.98998 3.98998 ZT8-11 2.81378 2.81378 2.81378 ZT12-15 0 0 0 ZT16-19 6.67753 6.67753 6.67753 ZT20-23 4.28224 4.28224 4.28224