condition mean min max ZT0-3 43.40975 26.95715 60.9531 ZT4-7 21.5304 21.5304 21.5304 ZT8-11 20.1082 20.1082 20.1082 ZT12-15 40.415225 37.1669 43.66355 ZT16-19 50.4884 50.4884 50.4884 ZT20-23 73.59765 73.59765 73.59765