condition mean min max ZT0-3 185.757234 185.757234 185.757234 ZT4-7 191.52644750000002 191.52644750000002 191.52644750000002 ZT8-11 168.5819955 168.5819955 168.5819955 ZT12-15 215.00601899999998 215.00601899999998 215.00601899999998 ZT16-19 231.9554615 231.9554615 231.9554615 ZT20-23 230.9040415 230.9040415 230.9040415