condition mean min max ZT0-3 7.51216 7.51216 7.51216 ZT4-7 6.58456 6.58456 6.58456 ZT8-11 8.841059999999999 8.841059999999999 8.841059999999999 ZT12-15 8.24574 8.24574 8.24574 ZT16-19 10.8732 10.8732 10.8732 ZT20-23 7.626155 7.626155 7.626155