condition mean min max ZT0-3 81.861901 81.861901 81.861901 ZT4-7 69.5125185 69.5125185 69.5125185 ZT8-11 70.597638 70.597638 70.597638 ZT12-15 81.69885450000001 81.69885450000001 81.69885450000001 ZT16-19 72.5180765 72.5180765 72.5180765 ZT20-23 71.374251 71.374251 71.374251