condition mean min max ZT0-3 51.33555 35.10505 60.955650000000006 ZT4-7 39.86535 39.86535 39.86535 ZT8-11 46.32225 46.32225 46.32225 ZT12-15 53.0109 44.0478 61.974 ZT16-19 74.11455000000001 74.11455000000001 74.11455000000001 ZT20-23 88.59895 88.59895 88.59895