condition mean min max ZT0-3 23.698057 23.698057 23.698057 ZT4-7 32.185945000000004 32.185945000000004 32.185945000000004 ZT8-11 34.561614000000006 34.561614000000006 34.561614000000006 ZT12-15 22.730769000000002 22.730769000000002 22.730769000000002 ZT16-19 39.6005735 39.6005735 39.6005735 ZT20-23 56.303877 56.303877 56.303877