condition mean min max ZT0-3 0.355295608 0.240695583 0.469895633 ZT4-7 0.41616043375 0.3347278305 0.49759303699999996 ZT8-11 0.6070687402499999 0.5880111705 0.62612631 ZT12-15 0.9095638312500001 0.6271917920000001 1.1919358705 ZT16-19 0.912549446 0.813752088 1.011346804 ZT20-23 0.61767364775 0.3612701445 0.874077151