condition mean min max ZT0-3 5.113595638 3.787446148 6.439745128 ZT4-7 4.9004253075 4.840735302666666 4.9601153123333335 ZT8-11 7.046203577 6.957442211 7.134964943 ZT12-15 8.9314035765 7.889568009 9.973239143999999 ZT16-19 10.271959280999999 10.198474642666666 10.345443919333333 ZT20-23 6.781361122333333 5.972777465666667 7.589944779