condition mean min max ZT0-3 9.369995 9.369995 9.369995 ZT4-7 10.735534000000001 10.735534000000001 10.735534000000001 ZT8-11 12.0995495 12.0995495 12.0995495 ZT12-15 10.0661045 10.0661045 10.0661045 ZT16-19 10.6081105 10.6081105 10.6081105 ZT20-23 9.239620500000001 9.239620500000001 9.239620500000001