condition mean min max ZT0-3 0.0224868555 0.0 0.044973711 ZT4-7 0.016871044166666665 0.0 0.03374208833333333 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.026425009833333332 0.0 0.052850019666666664 ZT20-23 0.008213077000000001 0.0 0.016426154000000002