condition mean min max ZT0-3 5.113525 5.00556 5.22149 ZT4-7 4.921295000000001 4.921295000000001 4.921295000000001 ZT8-11 3.0941 3.0941 3.0941 ZT12-15 0 0 0 ZT16-19 4.356255 4.356255 4.356255 ZT20-23 5.822205 5.822205 5.822205