condition mean min max ZT0-3 3.0016525 2.225105 3.7782 ZT4-7 7.190289999999999 7.190289999999999 7.190289999999999 ZT8-11 11.196185 11.196185 11.196185 ZT12-15 0 0 0 ZT16-19 8.3599 8.3599 8.3599 ZT20-23 4.47579 4.47579 4.47579