condition mean min max ZT0-3 6.6302875 6.52398 6.7365949999999994 ZT4-7 8.518695000000001 8.518695000000001 8.518695000000001 ZT8-11 13.90295 13.90295 13.90295 ZT12-15 0 0 0 ZT16-19 14.0637 14.0637 14.0637 ZT20-23 8.87949 8.87949 8.87949