condition mean min max ZT0-3 0.008326725 0.0 0.01665345 ZT4-7 0.0098531 0.0098531 0.0098531 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.008020733333333334 0.0 0.016041466666666667 ZT20-23 0 0 0