condition mean min max ZT0-3 39.887874999999994 38.6369 41.13885 ZT4-7 35.9762 35.9762 35.9762 ZT8-11 29.1804 29.1804 29.1804 ZT12-15 0 0 0 ZT16-19 50.5628 50.5628 50.5628 ZT20-23 52.7329 52.7329 52.7329