condition mean min max ZT0-3 1.188965 1.188965 1.188965 ZT4-7 1.030435 1.030435 1.030435 ZT8-11 1.111065 1.111065 1.111065 ZT12-15 1.318435 1.318435 1.318435 ZT16-19 3.49817 3.49817 3.49817 ZT20-23 1.501 1.501 1.501