condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.060981549 0.0 0.121963098 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.04822368433333333 0.029351478 0.06709589066666666 ZT20-23 0.0 0.0 0.0