condition mean min max ZT0-3 0.914231 0.731379 1.097083 ZT4-7 1.596425 1.596425 1.596425 ZT8-11 0.9964695 0.9964695 0.9964695 ZT12-15 0 0 0 ZT16-19 1.1475195 1.1475195 1.1475195 ZT20-23 1.0828285 1.0828285 1.0828285