condition mean min max ZT0-3 25.247925 23.907049999999998 26.5888 ZT4-7 16.0473 16.0473 16.0473 ZT8-11 13.4732 13.4732 13.4732 ZT12-15 0 0 0 ZT16-19 19.2968 19.2968 19.2968 ZT20-23 21.6717 21.6717 21.6717