condition mean min max ZT0-3 13.615643 13.615643 13.615643 ZT4-7 10.6323395 10.6323395 10.6323395 ZT8-11 13.181831500000001 13.181831500000001 13.181831500000001 ZT12-15 11.405537 11.405537 11.405537 ZT16-19 11.301501 11.301501 11.301501 ZT20-23 12.5493495 12.5493495 12.5493495