condition mean min max ZT0-3 7.7689975 7.48109 8.056905 ZT4-7 4.512005 4.512005 4.512005 ZT8-11 4.97209 4.97209 4.97209 ZT12-15 0 0 0 ZT16-19 8.38898 8.38898 8.38898 ZT20-23 8.057215 8.057215 8.057215