condition mean min max ZT0-3 1.147094 1.147094 1.147094 ZT4-7 0.4693075 0.4693075 0.4693075 ZT8-11 0.896421 0.896421 0.896421 ZT12-15 0.4680095 0.4680095 0.4680095 ZT16-19 0.613595 0.613595 0.613595 ZT20-23 0.7138645 0.7138645 0.7138645