condition mean min max ZT0-3 0.394844 0.3384115 0.4882585 ZT4-7 0.13822805 0.13822805 0.13822805 ZT8-11 0.31784965 0.31784965 0.31784965 ZT12-15 0.8621719999999999 0.7311675 0.9931765 ZT16-19 0.4399555 0.4399555 0.4399555 ZT20-23 0.9483474999999999 0.9483474999999999 0.9483474999999999