condition mean min max ZT0-3 0.7048093333333333 0.551993 0.860868 ZT4-7 0.23818499999999998 0.23818499999999998 0.23818499999999998 ZT8-11 1.1167 1.1167 1.1167 ZT12-15 0.9452345 0.8148995 1.0755695 ZT16-19 1.326255 1.326255 1.326255 ZT20-23 1.0311925 1.0311925 1.0311925