condition mean min max ZT0-3 28.781286 28.781286 28.781286 ZT4-7 51.71885950000001 51.71885950000001 51.71885950000001 ZT8-11 61.6540695 61.6540695 61.6540695 ZT12-15 55.5252785 55.5252785 55.5252785 ZT16-19 37.8642955 37.8642955 37.8642955 ZT20-23 28.191326 28.191326 28.191326