condition mean min max ZT0-3 2.79308 2.62452 2.96164 ZT4-7 6.32031 6.32031 6.32031 ZT8-11 11.57745 11.57745 11.57745 ZT12-15 0 0 0 ZT16-19 7.06726 7.06726 7.06726 ZT20-23 4.700795 4.700795 4.700795