condition mean min max ZT0-3 4.260481666666667 3.328685 5.75365 ZT4-7 0.781963 0.781963 0.781963 ZT8-11 0.4029925 0.4029925 0.4029925 ZT12-15 0.0 0.0 0.0 ZT16-19 0.3907195 0.3907195 0.3907195 ZT20-23 1.2903280000000001 1.2903280000000001 1.2903280000000001