condition mean min max ZT0-3 1.0254041666666667 0.6911674999999999 1.250925 ZT4-7 1.1421165 1.1421165 1.1421165 ZT8-11 1.347755 1.347755 1.347755 ZT12-15 3.9338049999999996 3.044865 4.822744999999999 ZT16-19 2.77616 2.77616 2.77616 ZT20-23 1.5368249999999999 1.5368249999999999 1.5368249999999999