condition mean min max ZT0-3 8.300078 8.300078 8.300078 ZT4-7 9.5118765 9.5118765 9.5118765 ZT8-11 8.883774 8.883774 8.883774 ZT12-15 8.147669 8.147669 8.147669 ZT16-19 8.258731000000001 8.258731000000001 8.258731000000001 ZT20-23 8.6225545 8.6225545 8.6225545