condition mean min max ZT0-3 43.930564 43.930564 43.930564 ZT4-7 52.0224645 52.0224645 52.0224645 ZT8-11 49.331637 49.331637 49.331637 ZT12-15 49.189664500000006 49.189664500000006 49.189664500000006 ZT16-19 44.703157000000004 44.703157000000004 44.703157000000004 ZT20-23 40.8861415 40.8861415 40.8861415