condition mean min max ZT0-3 0.355815 0.0 1.067445 ZT4-7 0.310661 0.310661 0.310661 ZT8-11 0.327301 0.327301 0.327301 ZT12-15 0.64857575 0.3183065 0.978845 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0