condition mean min max ZT0-3 0.751868 0.751868 0.751868 ZT4-7 0.3890375 0.3890375 0.3890375 ZT8-11 0.296184 0.296184 0.296184 ZT12-15 0.20402516666666667 0.20402516666666667 0.20402516666666667 ZT16-19 0.6344650000000001 0.6344650000000001 0.6344650000000001 ZT20-23 0.08455499999999999 0.08455499999999999 0.08455499999999999