condition mean min max ZT0-3 1.0628205985 0.9616952540000001 1.1639459429999999 ZT4-7 1.0353254975000001 0.9770413035000001 1.0936096915 ZT8-11 1.174033278 0.8696982625 1.4783682935 ZT12-15 1.325321821 1.221290179 1.429353463 ZT16-19 1.6655401115 1.3849315144999998 1.9461487085 ZT20-23 2.8575846932499998 2.845870481 2.8692989055