condition mean min max ZT0-3 1.47909 1.0672000000000001 1.7861850000000001 ZT4-7 1.89994 1.89994 1.89994 ZT8-11 1.0351915 1.0351915 1.0351915 ZT12-15 2.0815475 1.75224 2.410855 ZT16-19 1.38108 1.38108 1.38108 ZT20-23 1.6507225 1.6507225 1.6507225