condition mean min max ZT0-3 0.058447 0.058447 0.058447 ZT4-7 0.0386987 0.0386987 0.0386987 ZT8-11 0.0 0.0 0.0 ZT12-15 0.03844165 0.03844165 0.03844165 ZT16-19 0.08448554999999999 0.08448554999999999 0.08448554999999999 ZT20-23 0.09216305 0.09216305 0.09216305