condition mean min max ZT0-3 204.873597 204.873597 204.873597 ZT4-7 208.30008600000002 208.30008600000002 208.30008600000002 ZT8-11 221.635065 221.635065 221.635065 ZT12-15 240.8439225 240.8439225 240.8439225 ZT16-19 178.7691125 178.7691125 178.7691125 ZT20-23 164.142717 164.142717 164.142717