condition mean min max ZT0-3 24.131498 24.131498 24.131498 ZT4-7 49.510637 49.510637 49.510637 ZT8-11 67.7849005 67.7849005 67.7849005 ZT12-15 61.4786175 61.4786175 61.4786175 ZT16-19 39.9098075 39.9098075 39.9098075 ZT20-23 24.972757 24.972757 24.972757