condition mean min max ZT0-3 54.326199 54.326199 54.326199 ZT4-7 54.583768 54.583768 54.583768 ZT8-11 37.4878295 37.4878295 37.4878295 ZT12-15 37.358145 37.358145 37.358145 ZT16-19 17.071708 17.071708 17.071708 ZT20-23 18.523161 18.523161 18.523161