condition mean min max ZT0-3 0.33663627 0.108529872 0.5647426680000001 ZT4-7 4.118795109 1.604306596 6.6332836219999995 ZT8-11 12.736407541 11.869916437 13.602898645 ZT12-15 3.149504955 0.1286039415 6.1704059685 ZT16-19 0.02825248375 0.0 0.0565049675 ZT20-23 0.012207435749999999 0.0 0.024414871499999997