condition mean min max ZT0-3 50.580725 47.4249 53.73655 ZT4-7 39.9019 39.9019 39.9019 ZT8-11 34.71145 34.71145 34.71145 ZT12-15 0 0 0 ZT16-19 53.98935 53.98935 53.98935 ZT20-23 46.4764 46.4764 46.4764