condition mean min max ZT0-3 0.637278 0.637278 0.637278 ZT4-7 0.8087455000000001 0.8087455000000001 0.8087455000000001 ZT8-11 0.8407290000000001 0.8407290000000001 0.8407290000000001 ZT12-15 0.267444 0.267444 0.267444 ZT16-19 0.5877765 0.5877765 0.5877765 ZT20-23 0.697703 0.697703 0.697703