condition mean min max ZT0-3 23.0083 23.0083 23.0083 ZT4-7 18.886650000000003 18.886650000000003 18.886650000000003 ZT8-11 16.7224 16.7224 16.7224 ZT12-15 18.155450000000002 18.155450000000002 18.155450000000002 ZT16-19 21.63065 21.63065 21.63065 ZT20-23 23.31655 23.31655 23.31655