condition mean min max ZT0-3 37.845807 37.845807 37.845807 ZT4-7 45.942017 45.942017 45.942017 ZT8-11 52.959751 52.959751 52.959751 ZT12-15 44.4194165 44.4194165 44.4194165 ZT16-19 35.442472499999994 35.442472499999994 35.442472499999994 ZT20-23 35.7192455 35.7192455 35.7192455