condition mean min max ZT0-3 2292.95 2292.95 2292.95 ZT4-7 2543.8 2543.8 2543.8 ZT8-11 2425.5 2425.5 2425.5 ZT12-15 2367.75 2367.75 2367.75 ZT16-19 2395.75 2395.75 2395.75 ZT20-23 2411.5 2411.5 2411.5