condition mean min max ZT0-3 0.5615079700000001 0.337423088 0.7855928520000001 ZT4-7 0.6112037225 0.353422005 0.8689854400000001 ZT8-11 0.6944168008333333 0.42244685833333334 0.9663867433333333 ZT12-15 1.039649326 0.8223647289999999 1.256933923 ZT16-19 0.7116725133333334 0.33762918000000003 1.0857158466666668 ZT20-23 0.430887755 0.37744558300000003 0.484329927