condition mean min max ZT0-3 1.177154 0.7687925 1.89772 ZT4-7 2.530665 2.530665 2.530665 ZT8-11 1.2746650000000002 1.2746650000000002 1.2746650000000002 ZT12-15 1.0226165 0.299543 1.74569 ZT16-19 0.5567855 0.5567855 0.5567855 ZT20-23 1.1068435 1.1068435 1.1068435