condition mean min max ZT0-3 32.297675 29.86255 34.7328 ZT4-7 30.100700000000003 30.100700000000003 30.100700000000003 ZT8-11 35.9737 35.9737 35.9737 ZT12-15 0 0 0 ZT16-19 37.22280000000001 37.22280000000001 37.22280000000001 ZT20-23 28.9947 28.9947 28.9947