condition mean min max ZT0-3 14.729894 14.729894 14.729894 ZT4-7 17.09169 17.09169 17.09169 ZT8-11 18.9822195 18.9822195 18.9822195 ZT12-15 17.636757 17.636757 17.636757 ZT16-19 27.2441095 27.2441095 27.2441095 ZT20-23 30.628739500000002 30.628739500000002 30.628739500000002