condition mean min max ZT0-3 7.244468333333334 6.236190000000001 7.76884 ZT4-7 7.67736 7.67736 7.67736 ZT8-11 5.44184 5.44184 5.44184 ZT12-15 9.9946775 7.978854999999999 12.0105 ZT16-19 7.85779 7.85779 7.85779 ZT20-23 8.737645 8.737645 8.737645