condition mean min max ZT0-3 5130.683833 5130.683833 5130.683833 ZT4-7 3189.741682 3189.741682 3189.741682 ZT8-11 2634.529472 2634.529472 2634.529472 ZT12-15 1988.979609 1988.979609 1988.979609 ZT16-19 3146.8139955 3146.8139955 3146.8139955 ZT20-23 3434.862797 3434.862797 3434.862797