condition mean min max ZT0-3 1.0042686666666667 0.629927 1.5725500000000001 ZT4-7 0.4019455 0.4019455 0.4019455 ZT8-11 0.287029 0.287029 0.287029 ZT12-15 0.3507315 0.2368165 0.46464649999999996 ZT16-19 0.611488 0.611488 0.611488 ZT20-23 0.653625 0.653625 0.653625