condition mean min max ZT0-3 4.91086 4.91086 4.91086 ZT4-7 5.455995 5.455995 5.455995 ZT8-11 11.382549999999998 11.382549999999998 11.382549999999998 ZT12-15 8.016 8.016 8.016 ZT16-19 6.041015 6.041015 6.041015 ZT20-23 4.906750000000001 4.906750000000001 4.906750000000001