condition mean min max ZT0-3 3988.3999999999996 3988.3999999999996 3988.3999999999996 ZT4-7 4952.6 4952.6 4952.6 ZT8-11 4211.6 4211.6 4211.6 ZT12-15 3900.35 3900.35 3900.35 ZT16-19 4319.8 4319.8 4319.8 ZT20-23 4279.799999999999 4279.799999999999 4279.799999999999