condition mean min max ZT0-3 1147.304766 1147.304766 1147.304766 ZT4-7 457.314836 457.314836 457.314836 ZT8-11 203.264083 203.264083 203.264083 ZT12-15 257.32574999999997 257.32574999999997 257.32574999999997 ZT16-19 94.1557705 94.1557705 94.1557705 ZT20-23 78.41995 78.41995 78.41995