condition mean min max ZT0-3 11.87025 11.2196 12.568200000000001 ZT4-7 10.018585 10.018585 10.018585 ZT8-11 12.08865 12.08865 12.08865 ZT12-15 19.446825 16.77075 22.1229 ZT16-19 18.6567 18.6567 18.6567 ZT20-23 14.763549999999999 14.763549999999999 14.763549999999999