condition mean min max ZT0-3 3.503475 2.87678 4.13017 ZT4-7 2.104045 2.104045 2.104045 ZT8-11 2.6928 2.6928 2.6928 ZT12-15 0 0 0 ZT16-19 5.659165 5.659165 5.659165 ZT20-23 4.33539 4.33539 4.33539