condition mean min max ZT0-3 2.20207 2.20207 2.20207 ZT4-7 2.53696 2.53696 2.53696 ZT8-11 3.018145 3.018145 3.018145 ZT12-15 3.8581899999999996 3.8581899999999996 3.8581899999999996 ZT16-19 3.41257 3.41257 3.41257 ZT20-23 2.630255 2.630255 2.630255