condition mean min max ZT0-3 1.4941873333333335 0.8039725 2.8548400000000003 ZT4-7 0.388799 0.388799 0.388799 ZT8-11 1.004148 1.004148 1.004148 ZT12-15 1.15654775 0.8370155 1.47608 ZT16-19 1.8860484999999998 1.8860484999999998 1.8860484999999998 ZT20-23 1.7212450000000001 1.7212450000000001 1.7212450000000001