condition mean min max ZT0-3 0.146170275 0.10340964999999999 0.18893089999999998 ZT4-7 0.1862015 0.1862015 0.1862015 ZT8-11 0.48229049999999996 0.48229049999999996 0.48229049999999996 ZT12-15 0 0 0 ZT16-19 0.351085 0.351085 0.351085 ZT20-23 0.3529005 0.3529005 0.3529005