condition mean min max ZT0-3 2033.782656 2033.782656 2033.782656 ZT4-7 3554.6317129999998 3554.6317129999998 3554.6317129999998 ZT8-11 4366.685714 4366.685714 4366.685714 ZT12-15 3812.821408 3812.821408 3812.821408 ZT16-19 2087.673498 2087.673498 2087.673498 ZT20-23 1019.273807 1019.273807 1019.273807