condition mean min max ZT0-3 5.758405 5.572305 5.9445049999999995 ZT4-7 2.78558 2.78558 2.78558 ZT8-11 2.4206149999999997 2.4206149999999997 2.4206149999999997 ZT12-15 0 0 0 ZT16-19 3.41065 3.41065 3.41065 ZT20-23 3.9762899999999997 3.9762899999999997 3.9762899999999997