condition mean min max ZT0-3 0.0428252 0.0 0.0856504 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.056223499999999996 0.037736 0.074711 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0