condition mean min max ZT0-3 0.012275425 0.0 0.02455085 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.021196000000000003 0.0 0.042392000000000006 ZT16-19 0.017456966666666667 0.0 0.034913933333333334 ZT20-23 0 0 0