condition mean min max ZT0-3 10.60206 9.84985 11.2933 ZT4-7 9.94567 9.94567 9.94567 ZT8-11 9.377125 9.377125 9.377125 ZT12-15 10.65867 10.30504 11.0123 ZT16-19 9.754795 9.754795 9.754795 ZT20-23 11.4897 11.4897 11.4897