condition mean min max ZT0-3 7.3685624999999995 6.46605 8.271075 ZT4-7 7.213495 7.213495 7.213495 ZT8-11 5.74436 5.74436 5.74436 ZT12-15 0 0 0 ZT16-19 5.73256 5.73256 5.73256 ZT20-23 6.38321 6.38321 6.38321