condition mean min max ZT0-3 0.006647966666666667 0.0 0.0199439 ZT4-7 0.0195496 0.0195496 0.0195496 ZT8-11 0.0 0.0 0.0 ZT12-15 0.040814125 0.02003075 0.0615975 ZT16-19 0.0 0.0 0.0 ZT20-23 0.02163275 0.02163275 0.02163275