condition mean min max ZT0-3 31.984133333333332 5.6800999999999995 45.60295 ZT4-7 5.58385 5.58385 5.58385 ZT8-11 6.474935 6.474935 6.474935 ZT12-15 15.2422 10.4984 19.986 ZT16-19 22.757150000000003 22.757150000000003 22.757150000000003 ZT20-23 42.7479 42.7479 42.7479