condition mean min max ZT0-3 37.534311 37.534311 37.534311 ZT4-7 35.436177 35.436177 35.436177 ZT8-11 48.187087000000005 48.187087000000005 48.187087000000005 ZT12-15 69.0376855 69.0376855 69.0376855 ZT16-19 51.8814835 51.8814835 51.8814835 ZT20-23 31.889585500000003 31.889585500000003 31.889585500000003