condition mean min max ZT0-3 7.491505 7.19686 7.786149999999999 ZT4-7 8.03753 8.03753 8.03753 ZT8-11 14.3662 14.3662 14.3662 ZT12-15 0 0 0 ZT16-19 14.322849999999999 14.322849999999999 14.322849999999999 ZT20-23 9.607859999999999 9.607859999999999 9.607859999999999