condition mean min max ZT0-3 40.353928 40.353928 40.353928 ZT4-7 69.94416 69.94416 69.94416 ZT8-11 127.757399 127.757399 127.757399 ZT12-15 131.389914 131.389914 131.389914 ZT16-19 95.4681075 95.4681075 95.4681075 ZT20-23 51.121208 51.121208 51.121208