condition mean min max ZT0-3 4.08021 3.03524 5.649865 ZT4-7 5.602544999999999 5.602544999999999 5.602544999999999 ZT8-11 4.159345 4.159345 4.159345 ZT12-15 4.4707725 3.3685349999999996 5.57301 ZT16-19 3.567075 3.567075 3.567075 ZT20-23 3.732355 3.732355 3.732355