condition mean min max ZT0-3 83.847731 83.847731 83.847731 ZT4-7 209.110691 209.110691 209.110691 ZT8-11 239.12403849999998 239.12403849999998 239.12403849999998 ZT12-15 156.71446650000001 156.71446650000001 156.71446650000001 ZT16-19 127.2089565 127.2089565 127.2089565 ZT20-23 120.263226 120.263226 120.263226