condition mean min max ZT0-3 15.90295 15.90295 15.90295 ZT4-7 12.55645 12.55645 12.55645 ZT8-11 17.6271 17.6271 17.6271 ZT12-15 18.191 18.191 18.191 ZT16-19 21.9362 21.9362 21.9362 ZT20-23 17.713549999999998 17.713549999999998 17.713549999999998