condition mean min max ZT0-3 0.064163 0.0 0.128326 ZT4-7 0.20284850000000001 0.20284850000000001 0.20284850000000001 ZT8-11 0.381243 0.381243 0.381243 ZT12-15 0 0 0 ZT16-19 0.22117900000000001 0.22117900000000001 0.22117900000000001 ZT20-23 0.03186255 0.03186255 0.03186255