condition mean min max ZT0-3 4.3103 4.12871 4.49189 ZT4-7 7.160875 7.160875 7.160875 ZT8-11 8.489305 8.489305 8.489305 ZT12-15 0 0 0 ZT16-19 7.058645 7.058645 7.058645 ZT20-23 6.410295 6.410295 6.410295