condition mean min max ZT0-3 0.9117325000000001 0.7835965 1.0935185 ZT4-7 1.3272499999999998 1.3272499999999998 1.3272499999999998 ZT8-11 1.35114 1.35114 1.35114 ZT12-15 2.474455 2.30275 2.64616 ZT16-19 1.822495 1.822495 1.822495 ZT20-23 1.8066 1.8066 1.8066