condition mean min max ZT0-3 10.47115 10.47115 10.47115 ZT4-7 7.754865000000001 7.754865000000001 7.754865000000001 ZT8-11 7.672705 7.672705 7.672705 ZT12-15 8.726009999999999 8.726009999999999 8.726009999999999 ZT16-19 9.976365 9.976365 9.976365 ZT20-23 10.750900000000001 10.750900000000001 10.750900000000001