condition mean min max ZT0-3 4.5865325 3.1032349999999997 6.06983 ZT4-7 7.251004999999999 7.251004999999999 7.251004999999999 ZT8-11 4.364365 4.364365 4.364365 ZT12-15 0 0 0 ZT16-19 7.2250049999999995 7.2250049999999995 7.2250049999999995 ZT20-23 5.2434449999999995 5.2434449999999995 5.2434449999999995