condition mean min max ZT0-3 55.253891 55.253891 55.253891 ZT4-7 44.4572215 44.4572215 44.4572215 ZT8-11 52.771521500000006 52.771521500000006 52.771521500000006 ZT12-15 58.271583500000006 58.271583500000006 58.271583500000006 ZT16-19 69.01353 69.01353 69.01353 ZT20-23 62.775116000000004 62.775116000000004 62.775116000000004