condition mean min max ZT0-3 0.0041437 0.0041437 0.0041437 ZT4-7 0.0 0.0 0.0 ZT8-11 0.02689395 0.02689395 0.02689395 ZT12-15 0.0 0.0 0.0 ZT16-19 0.008885800000000001 0.008885800000000001 0.008885800000000001 ZT20-23 0.023617228333333334 0.023617228333333334 0.023617228333333334