condition mean min max ZT0-3 1.7869882499999998 1.5649615 2.0090149999999998 ZT4-7 2.70725 2.70725 2.70725 ZT8-11 3.023135 3.023135 3.023135 ZT12-15 0 0 0 ZT16-19 1.5665 1.5665 1.5665 ZT20-23 2.58343 2.58343 2.58343