condition mean min max ZT0-3 3.7527774999999997 3.208475 4.297079999999999 ZT4-7 4.4071 4.4071 4.4071 ZT8-11 7.7806049999999995 7.7806049999999995 7.7806049999999995 ZT12-15 0 0 0 ZT16-19 6.253875000000001 6.253875000000001 6.253875000000001 ZT20-23 5.7930399999999995 5.7930399999999995 5.7930399999999995