condition mean min max ZT0-3 24.928925 21.25865 28.599200000000003 ZT4-7 6.45593 6.45593 6.45593 ZT8-11 6.518885 6.518885 6.518885 ZT12-15 0 0 0 ZT16-19 6.386240000000001 6.386240000000001 6.386240000000001 ZT20-23 14.474450000000001 14.474450000000001 14.474450000000001