condition mean min max ZT0-3 38.80475 38.80475 38.80475 ZT4-7 19.1147 19.1147 19.1147 ZT8-11 40.725750000000005 40.725750000000005 40.725750000000005 ZT12-15 56.5032 56.5032 56.5032 ZT16-19 67.6517 67.6517 67.6517 ZT20-23 43.80265 43.80265 43.80265