condition mean min max ZT0-3 83.001656 83.001656 83.001656 ZT4-7 81.9326615 81.9326615 81.9326615 ZT8-11 75.945733 75.945733 75.945733 ZT12-15 86.0036155 86.0036155 86.0036155 ZT16-19 69.8904995 69.8904995 69.8904995 ZT20-23 83.6052335 83.6052335 83.6052335