condition mean min max ZT0-3 0.44394325 0.2962265 0.59166 ZT4-7 0.301833 0.301833 0.301833 ZT8-11 0.8876809999999999 0.8876809999999999 0.8876809999999999 ZT12-15 0 0 0 ZT16-19 1.45811 1.45811 1.45811 ZT20-23 4.398325 4.398325 4.398325