condition mean min max ZT0-3 19.494460885 11.74267246 27.24624931 ZT4-7 13.717675875 11.34150627 16.09384548 ZT8-11 8.83023829075 5.7447237005 11.915752881000001 ZT12-15 2.3241901687500004 2.0960784745 2.5523018630000003 ZT16-19 4.51767067575 3.7426117535 5.292729597999999 ZT20-23 5.1642171065 4.722946344 5.605487868999999