condition mean min max ZT0-3 326.045807 326.045807 326.045807 ZT4-7 203.8634955 203.8634955 203.8634955 ZT8-11 292.24977149999995 292.24977149999995 292.24977149999995 ZT12-15 313.8149235 313.8149235 313.8149235 ZT16-19 423.46975 423.46975 423.46975 ZT20-23 377.08101350000004 377.08101350000004 377.08101350000004