condition mean min max ZT0-3 53.3495 53.3495 53.3495 ZT4-7 51.9791 51.9791 51.9791 ZT8-11 48.96115 48.96115 48.96115 ZT12-15 53.6141 53.6141 53.6141 ZT16-19 60.3411 60.3411 60.3411 ZT20-23 62.727199999999996 62.727199999999996 62.727199999999996