condition mean min max ZT0-3 1.356247 1.16046 1.552034 ZT4-7 0.8391525 0.8391525 0.8391525 ZT8-11 1.71858 1.71858 1.71858 ZT12-15 0 0 0 ZT16-19 1.7329400000000001 1.7329400000000001 1.7329400000000001 ZT20-23 1.32652 1.32652 1.32652