condition mean min max ZT0-3 487.539749 487.539749 487.539749 ZT4-7 251.3596925 251.3596925 251.3596925 ZT8-11 298.20509000000004 298.20509000000004 298.20509000000004 ZT12-15 357.408341 357.408341 357.408341 ZT16-19 555.0250595 555.0250595 555.0250595 ZT20-23 640.374927 640.374927 640.374927