condition mean min max ZT0-3 6.7379075 5.584695 7.891120000000001 ZT4-7 3.888125 3.888125 3.888125 ZT8-11 2.2557799999999997 2.2557799999999997 2.2557799999999997 ZT12-15 0 0 0 ZT16-19 4.53524 4.53524 4.53524 ZT20-23 4.804295 4.804295 4.804295