condition mean min max ZT0-3 53.883757 53.883757 53.883757 ZT4-7 54.712969 54.712969 54.712969 ZT8-11 75.7318845 75.7318845 75.7318845 ZT12-15 67.08289149999999 67.08289149999999 67.08289149999999 ZT16-19 99.2717475 99.2717475 99.2717475 ZT20-23 71.68868900000001 71.68868900000001 71.68868900000001