condition mean min max ZT0-3 2689.532755 2689.532755 2689.532755 ZT4-7 731.354434 731.354434 731.354434 ZT8-11 995.5090495000001 995.5090495000001 995.5090495000001 ZT12-15 1197.553296 1197.553296 1197.553296 ZT16-19 1993.151212 1993.151212 1993.151212 ZT20-23 1920.7115534999998 1920.7115534999998 1920.7115534999998