condition mean min max ZT0-3 79.99126666666666 64.54905 108.446 ZT4-7 133.66899999999998 133.66899999999998 133.66899999999998 ZT8-11 83.6388 83.6388 83.6388 ZT12-15 78.62219999999999 75.7902 81.4542 ZT16-19 59.0571 59.0571 59.0571 ZT20-23 53.9875 53.9875 53.9875